--- loncom/xml/londefdef.pm	2002/04/04 19:20:33	1.50
+++ loncom/xml/londefdef.pm	2010/08/20 21:20:24	1.403.4.2
@@ -1,8 +1,7 @@
-
 # The LearningOnline Network with CAPA
 # Tags Default Definition Module 
 #
-# $Id: londefdef.pm,v 1.50 2002/04/04 19:20:33 sakharuk Exp $
+# $Id: londefdef.pm,v 1.403.4.2 2010/08/20 21:20:24 raeburn Exp $
 # 
 #
 # Copyright Michigan State University Board of Trustees
@@ -26,8 +25,7 @@
 # /home/httpd/html/adm/gpl.txt
 #
 # http://www.lon-capa.org/
-#
-# Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
+## Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
 # TtHfunc and TtMfunc (the "Code") may be compiled and linked into 
 # binary executable programs or libraries distributed by the 
 # Michigan State University (the "Licensee"), but any binaries so 
@@ -38,1521 +36,4929 @@
 # The C source of the Code may not be distributed by the Licensee
 # to any other parties under any circumstances.
 #
-#
-# last modified 06/26/00 by Alexander Sakharuk
-# 11/6,11/30,02/01/01,5/4 Gerd Kortemeyer
-# 01/18 Alex Sakharuk
 
 package Apache::londefdef; 
 
+use Apache::lonnet;
 use strict;
 use Apache::lonxml;
+use Apache::lontable;
+use Apache::File();
+use Image::Magick;
+use Apache::lonmenu();
+use Apache::lonmeta();
+use Apache::lonlocal;
+use Apache::Constants qw(:common);
+use File::Basename;
+use LONCAPA();
+# use Data::Dumper;
 
 BEGIN {
 
-    &Apache::lonxml::register('Apache::londefdef',('m','html','head','map','select','option','input','textarea','form','meta','title','body','center','b','strong','dt','h1','h2','h3','h4','h5','h6','cite','i','address','dd','dl','dir','ol','ul','menu','dfn','kbd','tt','code','em','q','p','br','big','small','basefont','font','s','sub','strike','sup','hr','a','li','u','output','param','applet','img','embed','allow','frameset','pre','insert','externallink','table'));
+    &Apache::lonxml::register('Apache::londefdef',('a','abbr','acronym','accessrule','address','allow','applet','area','b','base','basefont','bgo','bgsound','big','blink','blockquote','blankspace','body','br','button','caption','center','cite','code','col','colgroup','dd','del','dfn','dir','div','dl','dt','em','embed','externallink','fieldset','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','i','iframe','img','input','ins','insert','isindex','kbd','keygen','label','layer','legend','li','link','m','map','marquee','menu','meta','multicol','nobr','noembed','noframes','nolayer','noscript','object','ol','optgroup','option','output','p','param','pre','q','s','samp','select','server','small','spacer','span','strike','strong','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','tthoption','u','ul','var','wbr','hideweboutput'));
+
+}
+
 
+sub initialize_londefdef {
+    $Apache::londefdef::TD_redirection=0;
+    @Apache::londefdef::table = ();
+    $Apache::londefdef::select=0;
+    undef(@Apache::londefdef::description);
+    @Apache::londefdef::DD=(0);
+    @Apache::londefdef::DT=(0);
+    @Apache::londefdef::seenDT=(0);
+    $Apache::londefdef::list_index=0;
+    undef($Apache::londefdef::head);
+    undef($Apache::londefdef::title);
 }
 
 #======================= TAG SUBROUTINES =====================
 #-- <output>
 sub start_output {
-  my ($target) = @_;
-  if ($target eq 'meta') { $Apache::lonxml::metamode--; }
-  return '';
+    my ($target) = @_;
+    if ($target eq 'meta') { $Apache::lonxml::metamode--; }
+    return '';
 }
 sub end_output {
-  my ($target) = @_;
-  if ($target eq 'meta') { $Apache::lonxml::metamode++; }
-  return '';
+    my ($target) = @_;
+    if ($target eq 'meta') { $Apache::lonxml::metamode++; }
+    return '';
 }
 #-- <m> tag
 sub start_m {
-  my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-  my $currentstring = '';
-  if ($target eq 'web') {
-    my $inside = &Apache::lonxml::get_all_text("/m",$$parser[-1]);
-    $inside ='\\documentstyle{article}'.$inside;
-    &Apache::lonxml::debug("M is starting with:$inside:");
-    my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
-    if ($eval eq 'on') {
-      $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
-      #&Apache::lonxml::debug("M is evaulated to:$inside:");
-    }
-    $currentstring = &Apache::lontexconvert::converted(\$inside);
-    if ($Apache::lontexconvert::errorstring) {
-      &Apache::lonxml::warning("tth error: ".
-			       $Apache::lontexconvert::errorstring);
-      $Apache::lontexconvert::errorstring='';
-    }
-    #&Apache::lonxml::debug("M is ends with:$currentstring:");
-  } elsif ($target eq 'tex') {
-    $currentstring = "";
-  }
-  return $currentstring;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $currentstring = '';
+    my $inside = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
+    if ($target eq 'web' || $target eq 'analyze') {
+	&Apache::lonxml::debug("M is starting with:$inside:");
+	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
+	if ($eval eq 'on') {
+	    $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
+	    #&Apache::lonxml::debug("M is evaluated to:$inside:");
+	}
+	my $tex = $inside;
+	my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
+	$currentstring = &Apache::lontexconvert::converted(\$inside,$display);
+	if ($Apache::lontexconvert::errorstring) {
+	    my $errormsg='<pre>'.&HTML::Entities::encode($Apache::lontexconvert::errorstring,'<>&"').'</pre> occurred while attempting to convert this TeX: <pre>';
+	    $tex = &HTML::Entities::encode($tex,'<>&"');
+	    my ($linenumber) =
+		($Apache::lontexconvert::errorstring =~ /Line (\d+)/);
+	    if (defined($linenumber)) {
+		my @tex=split("\n",$tex);
+		$tex[$linenumber]='<b><font color="red">'.
+		    $tex[$linenumber].'</font></b>';
+		$tex=join("\n",@tex);
+	    }
+	    &Apache::lonxml::warning($errormsg.$tex.'</pre>');
+	    $Apache::lontexconvert::errorstring='';
+	}
+	#&Apache::lonxml::debug("M is ends with:$currentstring:");
+	$Apache::lonxml::post_evaluate=0;
+    } elsif ($target eq 'tex') {
+
+	$currentstring = $inside;
+	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
+	if ($eval eq 'on') {
+	    $currentstring=&Apache::run::evaluate($currentstring,$safeeval,$$parstack[-1]);
+	}
+	if ($currentstring=~/^(\s*\\\\\s*)*$/) {$currentstring = ' \vskip 0 mm ';}
+	# detect simple math mode entry exits, and convert them
+        # to use \ensuremath ... unless there's a \verb inside.
+	if (! ($currentstring=~/\\verb/)) {
+	    if ($currentstring=~/^\s*\$[^\$].*\$\s*$/) {
+		$currentstring=~s/^(\s*)\$/$1/;
+		$currentstring=~s/\$(\s*)$/$1/;
+		$currentstring='\ensuremath{'.$currentstring.'}';
+	    }
+	}
+	$Apache::lonxml::post_evaluate=0;
+    }
+    return $currentstring;
 }
+
 sub end_m {
-  my ($target,$token) = @_;
-  my $currentstring = '';
-  if ($target eq 'web') {
-  } elsif ($target eq 'tex') {
-    $currentstring = "";
-  } elsif ($target eq 'meta') {
-  }
-  return $currentstring;
-}
-#-- <html> tag    
-      sub start_html {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-	    if ($ENV{'browser.mathml'}) {
-	      &tth::ttminit();
-	    } else {
-	      &tth::tthinit();
-	    }
-            if ($target eq 'web') {
-              $currentstring = &Apache::lonxml::xmlbegin().
-                               &Apache::lonxml::fontsettings();     
-	    } elsif ($target eq 'tex') {
-	      $currentstring .= '\documentclass[letterpaper]{article}
-                                 \newcommand{\keephidden}[1]{}           
-                                 \usepackage[dvips]{graphicx}
-                                 \usepackage{epsfig}';
-	    }
-	   return $currentstring;
-	}
-        sub end_html {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-		$currentstring = &Apache::lonxml::xmlend();
-	    }
-	   return $currentstring;
-	}
-#-- <head> tag
-      sub start_head {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_head {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = &Apache::lonxml::registerurl(undef,$target).
-                               $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <map> tag
-      sub start_map {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_map {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <select> tag
-      sub start_select {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_select {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <option> tag
-      sub start_option {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_option {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <input> tag
-      sub start_input {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_input {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <textarea> tag
-      sub start_textarea {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_textarea {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <form> tag
-      sub start_form {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_form {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <title> tag
-      sub start_title {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring .= '\keephidden{' 
-	    }
-            if ($target eq 'meta') {
-		$currentstring='<title>';
-                &start_output();
-            }
-	   return $currentstring;
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'tex') {
+	$currentstring = "";
+    }
+    return $currentstring;
+}
+
+sub start_tthoption {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $result;
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $inside = &Apache::lonxml::get_all_text("/tthoption",$parser,
+						   $style);
+	$inside=~s/^\s*//;
+	if ($env{'browser.mathml'}) {
+	    &tth::ttmoptions($inside);
+	} else {
+	    &tth::tthoptions($inside);
 	}
-        sub end_title {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } elsif ($target eq 'tex') {
-              $currentstring .= '}';
-	    }  
-            if ($target eq 'meta') {
-               &end_output();
-               $currentstring='</title>';
-            } 
-	   return $currentstring;
-	}
-#-- <meta> tag
-      sub start_meta {
-	    my ($target,$token,$tagstack,$parstack,$parser) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	      my $args='';
-	      if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-	      if ($args eq '') {
-		&Apache::lonxml::get_all_text("/meta",$$parser[$#$parser]);
-	      } else {
-		$currentstring = $token->[4];
-	      }
-	    }
-            if ($target eq 'meta') {
-		unless ($token->[2]->{'http-equiv'}) {
-		    my $name=$token->[2]->{'name'};
-                    $name=~tr/A-Z/a-z/;
-                    $name=~s/\s/\_/g;
-                    if ($name) {
-                       $currentstring='<'.$name.'>'.
-                                         $token->[2]->{'content'}.
-			              '</'.$name.'>';
-		    }
+    }
+    return $result;
+}
+
+sub end_tthoption {
+    my ($target,$token) = @_;
+    my $result;
+    return $result;
+}
+
+#-- <html> tag (end tag optional)
+sub start_html {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'edit' || $target eq 'webgrade' ) {
+	# start_body() takes care of emitting the <html> 
+    } elsif ($target eq 'tex') {
+
+	$currentstring .= &latex_header();
+    }
+    return $currentstring;
+}
+
+sub end_html {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	# end_body takes care of the </html>
+    }
+    return $currentstring;
+}
+
+#-- <head> tag (end tag optional)
+sub start_head {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	&Apache::lonxml::startredirection();
+    } 
+    return $currentstring;
+}
+
+sub end_head {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if (($target eq 'web'      && $env{'request.state'} eq 'published') ||
+	($target eq 'webgrade' && $env{'request.state'} eq 'published')) {
+	# in case there is a </head> but no <head>
+	if ($Apache::lonxml::redirection) {
+	    $Apache::londefdef::head = &Apache::lonxml::endredirection();
+	}
+    } 
+    return $currentstring;
+}
+
+#-- <map> tag (end tag required)
+sub start_map {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_map {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <select> tag (end tag required)
+sub start_select {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    }  elsif ($target eq 'tex') {
+	$Apache::londefdef::select=0;
+    }
+    return $currentstring;
+}
+
+sub end_select {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <option> tag (end tag optional)
+sub start_option {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$Apache::londefdef::select++;
+	if ($Apache::londefdef::select == 1) {
+	    $currentstring='\noindent\fbox{'.&Apache::lonxml::get_param('value',$parstack,$safeeval).'}\keephidden{';
+	} else {
+	    $currentstring='\keephidden{';
+	}
+    }
+    return $currentstring;
+}
+
+sub end_option {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    }  elsif ($target eq 'tex') {
+	$currentstring='}';
+    }
+    return $currentstring;
+}
+
+#-- <input> tag (end tag forbidden)
+sub start_input {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_input {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <textarea> tag (end tag required)
+sub start_textarea {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_textarea {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <form> tag (end tag required)
+sub start_form {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_form {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <title> tag (end tag required)
+sub start_title {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$Apache::londefdef::title = 
+	    &Apache::lonxml::get_all_text('/title',$parser,$style);
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\keephidden{Title of the document:  ' 
+    }
+    if ($target eq 'meta') {
+	$currentstring='<title>';
+	&start_output($target);
+    }
+    return $currentstring;
+}
+
+sub end_title {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	# start_title takes care of swallowing the title
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }  
+    if ($target eq 'meta') {
+	&end_output($target);
+	$currentstring='</title>';
+    } 
+    return $currentstring;
+}
+
+#-- <meta> tag (end tag forbidden)
+sub start_meta {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $args='';
+	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+	if ($args eq '') {
+	    &Apache::lonxml::get_all_text("/meta",$parser,$style);
+	} else {
+	    $currentstring = $token->[4];
+	}
+    } elsif ($target eq 'meta') {
+	unless (&Apache::lonxml::get_param
+		('http-equiv',$parstack,$safeeval,undef,1)) {
+	    my $name=$token->[2]->{'name'};
+	    $name=~tr/A-Z/a-z/;
+	    $name=~s/\s/\_/gs;
+	    $name=~s/\W//gs;
+	    if ($name) {
+		$currentstring='<'.$name;
+                 my $display=&Apache::lonxml::get_param
+		('display',$parstack,$safeeval,undef,1);
+                if ($display) {
+                    $display=~s/\"/\'/g;
+		    $currentstring.=' display="'.$display.'"';
                 }
+		$currentstring.='>'.
+		    &Apache::lonxml::get_param
+			('content',$parstack,$safeeval,undef,1).
+			'</'.$name.'>';
 	    }
-	   return $currentstring;
+            my $display=&Apache::lonxml::get_param
+		('display',$parstack,$safeeval,undef,1);
+            if ($display) {
+		$display=&HTML::Entities::encode($display,'<>&"');
+		$currentstring.='<'.$name.'.display>'.$display.
+                               '</'.$name.'.display>';
+            }
 	}
-      sub end_meta {
-	my ($target,$token,$tagstack,$parstack,$parser) = @_;
-	my $currentstring = '';
-	if ($target eq 'web') {
-	  my $args='';
-	  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-	  if ($args ne '') {
+    } elsif ($target eq 'tex') {
+	my $content=&Apache::lonxml::get_param('content',$parstack,$safeeval);
+	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
+	if ((not defined $content) && (not defined $name)) {
+	    &Apache::lonxml::startredirection();
+	}
+    } elsif ($target eq 'edit') {
+	$currentstring .= &Apache::edit::tag_start($target,$token);
+	$currentstring .= &Apache::edit::text_arg('Name:','name',$token,30);
+	$currentstring .= &Apache::edit::text_arg('Content:','content',$token,70);
+	$currentstring .= &Apache::edit::end_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag =
+	    &Apache::edit::get_new_args($token,$parstack,$safeeval,
+					'name','content');
+	if ($constructtag) { $currentstring = &Apache::edit::rebuild_tag($token); }
+    }
+    return $currentstring;
+}
+
+sub end_meta {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $args='';
+	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+	if ($args ne '') {
 	    $currentstring = $token->[4];
-	  }
-	} 
-	return $currentstring;
-      }
-#-- <body> tag
-        sub start_body {
-            my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-#	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	      if (!$Apache::lonxml::registered) {
-		$currentstring.='<head>'.
-		    &Apache::lonxml::registerurl(undef,$target).'</head>';
-	      }
-	      my $onLoad='';
-	      foreach my $key (keys(%{$token->[2]})) {
-		if ($key =~ /^onload$/i) {
-		  $onLoad.=$token->[2]->{$key}.';';
-		  delete($token->[2]->{$key});
-		}
-	      }
-	      $token->[2]->{'onLoad'}=$onLoad.&Apache::lonxml::loadevents();
-	      my $onUnload='';
-	      foreach my $key (keys(%{$token->[2]})) {
-		if ($key =~ /^onunload$/i) {
-		  $onUnload.=$token->[2]->{$key}.';';
-		  delete($token->[2]->{$key});
-		}
-	      }
-	      $token->[2]->{'onUnload'}=$onUnload.
-		&Apache::lonxml::unloadevents();
-
-	      $currentstring .= '<'.$token->[1];
-	      foreach (keys %{$token->[2]}) {
-	      	$currentstring.=' '.$_.'="'.$token->[2]->{$_}.'"';
-	      }
-	      $currentstring.='>';
-	      if ($ENV{'request.state'} ne 'published') {
-		$currentstring.=(<<EDITBUTTON);
-		<form method="post">
-		<input type="submit" name="editmode" value="Edit" />
-		</form>
-EDITBUTTON
-	      }
-       	    } elsif ($target eq 'tex') {
-              $currentstring = '\begin{document}';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_body {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\end{document}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <center> tag
-        sub start_center {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\begin{center}';  
-	    }  elsif ($target eq 'latexsource') {
-              $currentstring = '\begin{center}';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_center {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\end{center}';  
-	    }  elsif ($target eq 'latexsource') {
-              $currentstring = '\end{center}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <b> tag
-        sub start_b {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\textbf{';  
-	    }  elsif ($target eq 'latexsource') {
-              $currentstring = '\textbf{';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_b {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '}';  
-
-	    } elsif ($target eq 'latexsource') {
-              $currentstring = '}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <strong> tag
-        sub start_strong {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\textbf{';  
-	    } elsif ($target eq 'latexsource') {
-              $currentstring = '\textbf{';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_strong {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '}';  
-	    }  elsif ($target eq 'latexsource') {
-              $currentstring = '}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <h1> tag
-        sub start_h1 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } elsif ($target eq 'meta') {
-		$currentstring='<subject>';
-                &start_output();
-            }
-           return $currentstring;
 	}
-        sub end_h1 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } elsif ($target eq 'meta') {
-                &end_output();
-		$currentstring='</subject>';
-            } 
-           return $currentstring;
+    } elsif ($target eq 'tex') {
+	my $content=&Apache::lonxml::get_param('content',$parstack,$safeeval);
+	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
+	if ((not defined $content) && (not defined $name)) {
+	    &Apache::lonxml::endredirection();
 	}
+    }
+    return $currentstring;
+}
+
+sub insert_meta {
+    return '
+    <meta />';
+}
+
+# accessrule
+sub start_accessrule {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $currentstring = '';
+    my $eff  =&Apache::lonxml::get_param('effect',$parstack,$safeeval,undef,1);
+    my $realm=&Apache::lonxml::get_param('realm', $parstack,$safeeval,undef,1);
+    my $role =&Apache::lonxml::get_param('role',  $parstack,$safeeval,undef,1);
+    my $type =&Apache::lonxml::get_param('type',  $parstack,$safeeval,undef,1);
+
+    my ($dom,$crs,$sec,$separator);
+    if ($type eq 'user') {
+	($dom,$crs,$sec)=split(m{/},$realm);
+	$crs = &LONCAPA::clean_username($crs);
+	$separator = '/';
+    } else {
+	($dom,$crs,$sec)=split(/\_/,$realm);
+	$crs = &LONCAPA::clean_courseid($crs);
+	$separator = '_';
+    }
+    $dom = &LONCAPA::clean_domain($dom);
+
+    $sec =~s/\W//;
+    $realm = $dom;
+    if ($crs =~ /\S/) { $realm .= $separator.$crs; }
+    if ($sec =~ /\S/) { $realm .= $separator.$sec; }
+    $role=~s/\W//g;
+
+    if ($target eq 'web') {
+	my $args='';
+	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+	if ($args eq '') {
+	    &Apache::lonxml::get_all_text("/accessrule",$parser,$style);
+	} else {
+	    $currentstring = $token->[4];
+	}
+    }
+    if ($target eq 'meta') {
+	$currentstring='<rule>'.$eff.':'.$realm.':'.$role.':'.$type.'</rule>';
+    }
+    return $currentstring;
+}
+
+sub end_accessrule {
+    my ($target,$token,$tagstack,$parstack,$parser) = @_;
+    my $currentstring = '';
+    if ($target eq 'web') {
+	my $args='';
+	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+	if ($args ne '') {
+	    $currentstring = $token->[4];
+	}
+    } 
+    return $currentstring;
+}
+
+sub generate_css_links {
+    my $links;
+    my $css_href = &Apache::lonnet::EXT('resource.0.cssfile');
+    if ($css_href =~ /\S/) {
+	&Apache::lonxml::extlink($css_href);
+	$links .= 
+	    '<link rel="stylesheet" type="text/css" href="'.$css_href.'" />';
+    }
+    return $links;
+}
+
+#-- <body> tag (end tag required)
+sub start_body {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+
+    if ($target eq 'web' || $target eq 'webgrade') {
+	if ($Apache::lonhomework::parsing_a_problem) {
+	    &Apache::lonxml::warning("<body> tag found inside of <problem> tag this can cause problems.");
+	    return '';
+	}
+	
+	if (&is_inside_of($tagstack, "head")) {
+	    &end_head(@_);
+	}
+	
+	my $extra_head = &generate_css_links();
+
+	$currentstring = 
+	    &Apache::loncommon::start_page($Apache::londefdef::title,
+					   $Apache::londefdef::head
+					      .$extra_head,
+					   {'add_entries'    => $token->[2],
+					    'no_title'       => 1,
+					    'force_register' => 1});
+
+	if ($env{'request.state'} ne 'published') {
+	    $currentstring.=&Apache::lonmenu::constspaceform();
+	    $currentstring.=&Apache::londefdef::edit_controls();
+	}
+	$currentstring.=&Apache::lonxml::message_location();
+    } elsif ($target eq 'tex') {
+	$currentstring = '';   #  '\begin{document}' is in header.
+    } 
+    return $currentstring;
+}
+
+sub edit_controls {
+    my ($nochgview) = @_;
+    my $result .= '
+<form method="post">
+<div class="LC_edit_problem_header">';
+    unless ($nochgview) {
+        $result .= '
+<div class="LC_edit_problem_header_row1">'.
+&Apache::lonxml::renderingoptions().'
+<input type="submit" name="changeproblemmode" value="'.&mt('Change View').'" />
+</div>';
+    }
+    $result .= '
+<div class="LC_edit_problem_header_edit_row"><input type="submit" name="editmode" accesskey="e" value="'.&mt('Edit').'" /></div></div>
+</form>
+<br />';
+    return $result;
+}
+
+sub end_body {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off unclosed <p>
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= &Apache::loncommon::end_page({'discussion' => 1});
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\strut\newline\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\newline\noindent \end{document}';  
+    } 
+    return $currentstring;
+}
+
+# \begin{center} causes a new paragprah spacing that looks odd inside 
+# of a table cell.  Same at the end of a \center but with a slightly
+# larger space .. hence center_correction and center_end_correction.
+#
+sub center_correction { return '\vspace*{-6 mm}'; } 
+sub center_end_correction { return '\vspace*{-7 mm}'; }
+
+#-- <center> tag (end tag required)
+sub start_center {
+    my ($target,$token,$tagstack) = @_;
+    my $currentstring = &end_p();	# Close off any prior para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	if (&is_inside_of($tagstack, "table")) {
+	    $currentstring .= &center_correction();
+	}
+	$currentstring .= '\begin{center}';  
+    }
+    return $currentstring;
+}
+
+sub end_center {
+    my ($target,$token,$tagstack) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	$currentstring = '\end{center}';  
+	if (&is_inside_of($tagstack, "table")) {
+	    $currentstring .= &center_end_correction();
+	}
+    }
+    return $currentstring;
+}
+
+#-- <b> tag (end tag required)
+#      NOTE: In TeX mode disables internal <p>
+sub start_b {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	&disable_para();
+	$currentstring .= '\textbf{';  
+    } 
+    return $currentstring;
+}
+
+sub end_b {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	&enable_para();
+	$currentstring = '}';
+    } 
+    return $currentstring;
+}
+
+#-- <strong> tag (end tag required)
+#    NOTE: in TeX mode disables internal <p>
+sub start_strong {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	&disable_para();
+	$currentstring = '\textbf{';  
+    } 
+    return $currentstring;
+}
+
+sub end_strong {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {	
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	&enable_para();
+	$currentstring = '}';  
+    }
+    return $currentstring;
+}
+
+#-- <h1> tag (end tag required)
+sub start_h1 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=lc(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1));
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } elsif ($target eq 'meta') {
+	$currentstring.='<subject>';
+	&start_output($target);
+    }
+    return $currentstring;
+}
+
+sub end_h1 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
+	}
+	$currentstring .= '}}'.$post;
+    } elsif ($target eq 'meta') {
+	&end_output($target);
+	$currentstring='</subject>';
+    } 
+    return $currentstring;
+}
+
 #-- <h2> tag
-        sub start_h2 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } 
-           return $currentstring;
-	}
-        sub end_h2 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } 
-           return $currentstring;
+sub start_h2 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } 
+    return $currentstring;
+}
+
+sub end_h2 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
 	}
+	$currentstring .= '}}'.$post;
+    } 
+    return $currentstring;
+}
+
 #-- <h3> tag
-        sub start_h3 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } 
-           return $currentstring;
-	}
-        sub end_h3 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } 
-           return $currentstring;
+sub start_h3 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } 
+    return $currentstring;
+}
+
+sub end_h3 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
 	}
+	$currentstring .= '}}'.$post;
+    } 
+    return $currentstring;
+}
+
 #-- <h4> tag
-        sub start_h4 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } 
-           return $currentstring;
-	}
-        sub end_h4 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } 
-           return $currentstring;
+sub start_h4 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } 
+    return $currentstring;
+}
+
+sub end_h4 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
 	}
+	$currentstring .= '}}'.$post;
+    } 
+    return $currentstring;
+}
+
 #-- <h5> tag
-        sub start_h5 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } 
-           return $currentstring;
-	}
-        sub end_h5 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } 
-           return $currentstring;
+sub start_h5 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior paras.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } 
+    return $currentstring;
+}
+
+sub end_h5 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
 	}
+	$currentstring .= '}}'.$post;
+    } 
+    return $currentstring;
+}
+
 #-- <h6> tag
-        sub start_h6 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{\textbf{';
-	    } 
-           return $currentstring;
-	}
-        sub end_h6 {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}}';
-	    } 
-           return $currentstring;
-	}
-#--- <cite> tag
-        sub start_cite {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\textit{";
-	    }  elsif ($target eq 'latexsource') {
-		$currentstring .= "\\textit{";
-	    } 
-           return $currentstring;
-	}
-        sub end_cite {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "}";
-	    }  elsif ($target eq 'latexsource') {
-		$currentstring .= "}";
-	    } 
-           return $currentstring;
-	}
-#-- <i> tag
-        sub start_i {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\textit{';
-	    }  elsif ($target eq 'latexsource') {
-		$currentstring .= '\textit{';
-	    } 
-           return $currentstring;
-	}
-        sub end_i {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '}';
-	    } 
-           return $currentstring;
-	}
-#-- <address> tag
-        sub start_address {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\textit{";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "\\textit{";
-	    } 
-           return $currentstring;
-	}
-        sub end_address {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "}";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "}";
-	    }
-           return $currentstring;
-	}
-#-- <dfn> tag
-        sub start_dfn {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\textit{";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "\\textit{";
-	    } 
-           return $currentstring;
-	}
-        sub end_dfn {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "}";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "}";
-	    } 
-           return $currentstring;
-	}
-#-- <tt> tag
-        sub start_tt {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\texttt{';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '\texttt{';
-	    } 
-           return $currentstring;
-	}
-        sub end_tt {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '}';
-	    }
-           return $currentstring;
-	}
-#-- <kbd> tag
-        sub start_kbd {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\texttt";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "\\texttt{";
-	    } 
-           return $currentstring;
-	}
-        sub end_kbd {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "}";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "}";
-	    } 
-           return $currentstring;
-	}
-#-- <code> tag
-        sub start_code {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\texttt{';
-	    } 
-           return $currentstring;
-	}
-        sub end_code {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}';
-	    } 
-           return $currentstring;
-	}
-#-- <em> tag
-        sub start_em {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\emph{';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '\emph{';
-	    } 
-           return $currentstring;
-	}
-        sub end_em {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '}';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '}';
-	    }  
-           return $currentstring;
-	}
-#-- <q> tag
-        sub start_q {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\emph{";
-	    }  elsif ($target eq 'latexsource') {
-		$currentstring .= "\\emph{";
-	    }
-           return $currentstring;
-	}
-        sub end_q {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "}";
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= "}";
-	    }  
-           return $currentstring;
-	}
-#-- <p> tag
-        sub start_p {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '{\par ';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '{\par ';
-	    } 
-           return $currentstring;
-	}
-        sub end_p {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= '}';
-            } elsif ($target eq 'latexsource') {
-	        $currentstring .= '}';
-            }
-           return $currentstring;
+sub start_h6 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off any prior paras.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my $pre;
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $pre='\begin{center}';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{';
+	}
+	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
+	if (not defined $TeXsize) {$TeXsize="large";}
+	$currentstring .= '\strut\newline '.$pre.'{\\'.$TeXsize.' \textbf{'; 
+    } 
+    return $currentstring;
+}
+
+sub end_h6 {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	my $post='\vskip 0 mm ';
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $post='\end{center}';
+	} elsif ($align eq 'left') {
+	    $post='} \hfill'.'\vskip 0 mm ';
+	} elsif ($align eq 'right') {
+	    $post='}'.'\vskip 0 mm ';
 	}
-#-- <br> tag
-        sub start_br {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\\\\';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '\\';
-	    } 
-           return $currentstring;
-	}
-        sub end_br {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    }
-           return $currentstring;
-	}
-#-- <big> tag
-        sub start_big {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\large{';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '{\Large ';
-	    }  
-           return $currentstring;
-	}
-        sub end_big {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= '}';
-            } elsif ($target eq 'latexsource') {
-	        $currentstring .= '}';
-            }
-           return $currentstring;
+	$currentstring .= '}}'.$post;
+    } 
+    return $currentstring;
+}
+
+#--- <cite> tag (end tag required)
+sub start_cite {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\textit{';
+    }
+    return $currentstring;
+}
+
+sub end_cite {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <i> tag (end tag required)
+sub start_i {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\textit{';
+    }
+    return $currentstring;
+}
+
+sub end_i {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    } 
+    return $currentstring;
+}
+
+#-- <address> tag (end tag required)
+sub start_address {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\textit{';
+    }
+    return $currentstring;
+}
+
+sub end_address {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <dfn> tag (end tag required)
+sub start_dfn {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\textit{';
+    } 
+    return $currentstring;
+}
+
+sub end_dfn {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <tt> tag (end tag required)
+sub start_tt {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\texttt{';
+    }
+    return $currentstring;
+}
+
+sub end_tt {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <kbd> tag (end tag required)
+sub start_kbd {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\texttt{';
+    }
+    return $currentstring;
+}
+
+sub end_kbd {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <code> tag (end tag required)
+sub start_code {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\texttt{';
+    } 
+    return $currentstring;
+}
+
+sub end_code {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    } 
+    return $currentstring;
+}
+
+#-- <em> tag (end tag required)
+sub start_em {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\emph{';
+    }
+    return $currentstring;
+}
+
+sub end_em {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    } 
+    return $currentstring;
+}
+
+#-- <q> tag (end tag required)
+sub start_q {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\emph{';
+    }
+    return $currentstring;
+}
+
+sub end_q {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    } 
+    return $currentstring;
+}
+
+#  <p> is a bit strange since it does not require a closing </p>
+#  However in latex, we must often output closing stuff to end
+#  environments and {}'s etc.  Therefore we do all the work
+#  of figuring out the ending strings in the start tag processing,
+#  and provide a mechanism to output the stop text external
+#  to tag processing.
+#
+{
+
+    my $closing_string = '';		# String required to close <p>
+
+#   Some tags are <p> fragile meaning that <p> inside of them
+#   does not work within TeX mode.  This is managed via the 
+#   counter below:
+#
+
+    my $para_disabled = 0;
+
+sub disable_para {
+    $para_disabled++;
+}
+sub enable_para {
+    $para_disabled--;
+}
+
+
+#-- <p> tag (end tag optional)
+#optional attribute - align="center|left|right"
+sub start_p {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= &end_p();	# close off prior para if in progress.
+	$currentstring .= $token->[4];
+	if (! ($currentstring =~ /\//)) {
+	    $closing_string = '</p>'; # Deal correctly with <p /> e.g.
 	}
-#-- <small> tag
-        sub start_small {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '{\footnotesize ';
-	    } elsif ($target eq 'latexsource') {
-		$currentstring .= '{\footnotesize ';
-	    } 
-           return $currentstring;
-	}
-        sub end_small {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= '}';
-            } elsif ($target eq 'latexsource') {
-	        $currentstring .= '}';
-            }
-           return $currentstring;
+    } elsif ($target eq 'tex' && !$para_disabled) {
+
+	$currentstring .= &end_p();	# close off prior para if in progress.
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($align eq 'center') {
+	    $currentstring .='\begin{center}\par ';
+	    $closing_string = '\end{center}';
+	    if (&is_inside_of($tagstack, "table")) {
+		$currentstring = &center_correction().$currentstring;
+	    }
+	} elsif ($align eq 'right') {
+	    $currentstring.="\n".'{\flushright ';
+#	    $currentstring.='\makebox['.$env{'form.textwidth'}.']{\hfill\llap{';
+	    $closing_string= "}\n";
+	} elsif ($align eq 'left') {
+	    $currentstring.= "\n".'{\flushleft ';
+#	    $currentstring.='\noindent\makebox['.$env{'form.textwidth'}.']{{';
+	    $closing_string = "}\n";
+	} else {
+            $currentstring.='\par ';
+	    if (&is_inside_of($tagstack, 'table')) {
+		$closing_string = '\vskip 0pt'; # Seems to be consistent with <p> in tables.
+	    } else {
+		$closing_string = '\strut\\\\\strut ';
+	    }
+        }
+
+    }
+    return $currentstring;
+}
+#
+#  End paragraph processing just requires that we output the
+#  closing string that was saved and blank it.
+sub end_p {
+    #  Note only 'tex' mode uses disable_para and enable_para
+    #  so we don't need to know the target in the check below:
+
+    if (!$para_disabled) {
+	my $current_string = $closing_string;
+	$closing_string = '';	# Not in a para anymore.
+	return $current_string;
+    } else {
+	return '';
+    }
+
+}
+}
+#-- <br> tag (end tag forbidden)
+sub start_br {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	my @tempo=@$tagstack;
+	my $signal=0;
+	#  Not going to factor this to is_inside_of since that would require
+        #  multiple stack traversals.
+	#
+	for (my $i=$#tempo;$i>=0;$i--) {
+	    if (($tempo[$i] eq 'b') || ($tempo[$i] eq 'strong') ||
+                ($tempo[$i] eq 'ol') || ($tempo[$i] eq 'ul'))  {
+		$signal=1;
+	    }
+	    if (($tempo[$i] eq 'td') || ($tempo[$i] eq 'th')) {
+		$signal = 1;
+	    }
 	}
-#-- <basefont> tag
-      sub start_basefont {
-	my ($target,$token) = @_;
-	my $currentstring = '';
-	if ($target eq 'web') {
-	  $currentstring = $token->[4];     
-	} 
-	return $currentstring;
-      }
-      sub end_basefont {
-	my ($target,$token) = @_;
-	my $currentstring = '';
-	if ($target eq 'web') {
-	  $currentstring = $token->[4];     
-	} 
-	return $currentstring;
-      }
-#-- <font> tag
-         sub start_font {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_font {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	} 
-#-- <strike> tag
-        sub start_strike {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "{\\underline ";
-	    } 
-           return $currentstring;
-	}
-        sub end_strike {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= " }";
-            }
-           return $currentstring;
+	if ($signal != 1) {
+	    $currentstring .= '\strut \\\\ \strut ';
 	}
-#-- <s> tag
-        sub start_s {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "{\\underline ";
-	    } 
-           return $currentstring;
-	}
-        sub end_s {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= " }";
-            }
-           return $currentstring;
+    
+    }
+    return $currentstring;
+}
+
+sub end_br {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    }
+    return $currentstring;
+}
+
+#-- <big> tag (end tag required)
+sub start_big {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '{\large ';
+    } 
+    return $currentstring;
+}
+
+sub end_big {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <small> tag (end tag required)
+sub start_small {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '{\footnotesize ';
+    }
+    return $currentstring;
+}
+
+sub end_small {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}';
+    }
+    return $currentstring;
+}
+
+#-- <basefont> tag (end tag forbidden)
+sub start_basefont {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
+	if (defined $basesize) {
+	    $currentstring = '{\\'.$basesize.' ';
 	}
-#-- <sub> tag
-        sub start_sub {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\$_{ ";
-	    } 
-           return $currentstring;
-	}
-        sub end_sub {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= " }\$";
-            }
-           return $currentstring;
+    }
+    return $currentstring;
+}
+
+sub end_basefont {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
+	if (defined $basesize) {
+	    $currentstring = '}';
 	}
-#-- <sup> tag
-        sub start_sup {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\$^{ ";
-	    } 
-           return $currentstring;
-	}
-        sub end_sup {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= " }\$";
+    }
+    return $currentstring;
+}
+
+#-- <font> tag (end tag required)
+sub start_font {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $face=&Apache::lonxml::get_param('face',$parstack,$safeeval);
+	if ($face!~/symbol/i) {
+	    if (($env{'browser.fontenhance'} eq 'on') || 
+		($env{'browser.blackwhite'} eq 'on')) { return ''; }
+	}
+	$currentstring = $token->[4];     
+    }  elsif ($target eq 'tex') {
+	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
+	if (defined $fontsize) {
+	    $currentstring = '{\\'.$fontsize.' ';
+	}
+    }
+    return $currentstring;
+}
+
+sub end_font {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    }  elsif ($target eq 'tex') {
+	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
+	if (defined $fontsize) {
+	    $currentstring = '}';
+	}
+    }
+    return $currentstring;
+}
+ 
+#-- <strike> tag (end tag required)
+sub start_strike {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	&Apache::lonxml::startredirection();
+    } 
+    return $currentstring;
+}
+
+sub end_strike {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring=&Apache::lonxml::endredirection();
+	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g; 
+	$currentstring=~s/^\s*(\S)/\\underline\{$1/; 
+	$currentstring=~s/(\S)\s*$/$1\}/;
+    }
+    return $currentstring;
+}
+
+#-- <s> tag (end tag required)
+sub start_s {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	&Apache::lonxml::startredirection();
+    } 
+    return $currentstring;
+}
+
+sub end_s {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring=&Apache::lonxml::endredirection();
+	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
+	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
+	$currentstring=~s/(\S)\s*$/$1\}/;	
+    }
+    return $currentstring;
+}
+
+#-- <sub> tag (end tag required)
+sub start_sub {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\raisebox{-\smallskipamount}{\scriptsize{';
+    } 
+    return $currentstring;
+}
+
+sub end_sub {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}}';
+    }
+    return $currentstring;
+}
+
+#-- <sup> tag (end tag required)
+sub start_sup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\raisebox{\smallskipamount}{\scriptsize{';
+    } 
+    return $currentstring;
+}
+
+sub end_sup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '}}';
+    }
+    return $currentstring;
+}
+
+#-- <hr> tag (end tag forbidden)
+sub start_hr {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# End enclosing para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+
+	# <hr /> can't be inside of <sup><sub> thank you LaTeX.
+	# 
+	my $restart_sub = 0;
+	my $restart_sup = 0;
+
+	# Since <sub> and <sup> are simple tags it's ok to turn off/on
+	# using the start_ stop_ functions.. those tags only care about
+	# $target.
+
+	if (&is_inside_of($tagstack, "sub")) {
+	    $restart_sub = 1;
+	    $currentstring .= &end_sub($target, $token, $tagstack, 
+				       $parstack, $parser, $safeeval);
+	}
+	if (&is_inside_of($tagstack, "sup")) {
+	    $restart_sup = 1;
+	    $currentstring .= &end_sup($target, $token, $tagstack,
+				       $parstack, $parser, $safeeval);
+	}	
+
+	my $LaTeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+	if (defined $LaTeXwidth) {
+	    if ($LaTeXwidth=~/^%/) {
+		substr($LaTeXwidth,0,1)='';
+		$LaTeXwidth=($LaTeXwidth/100).'\textwidth';
+	    }
+	} else {
+	    $LaTeXwidth ='0.9\textwidth';
+	}
+	my ($pre,$post);
+	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if (($align eq 'center') || (not defined $align)) {
+	    $pre=''; $post='';
+	} elsif ($align eq 'left') {
+	    $pre='\rlap{'; $post='} \hfill';
+	} elsif ($align eq 'right') {
+	    $pre=' \hfill \llap{'; $post='}';
+	}
+	$currentstring .= ' \vskip 0 mm \noindent\makebox['.$LaTeXwidth.']{'.$pre.'\makebox['.
+                                    $LaTeXwidth.'][b]{\hrulefill}'.$post.'}\vskip 0 mm ';
+	# Turn stuff back on that we can't be inside of.
+
+	if ($restart_sub) {
+	    $currentstring .= &start_sub($target, $token, $tagstack,
+					$parstack, $parser, $safeeval);
+	}
+	if ($restart_sup) {
+	    $currentstring .= &start_sup($target, $token, $tagstack,
+					 $parstack, $parser, $safeeval);
+	}	
+    } 
+    return $currentstring;
+}
+
+sub end_hr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    }
+    return $currentstring;
+}
+
+#-- <div> tag (end tag required)
+{
+
+#  Since div can be nested, the stack below is used
+#  in 'tex' mode to store the ending strings
+#  for the div stack.
+
+    my @div_end_stack;
+
+sub start_div {
+    my ($target,$token, $tagstack, $parstack, $parser, $safeeval) = @_;
+    my $currentstring = &end_p();	# Close enclosing para.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } 
+    if ($target eq 'tex') {
+	# 4 possible alignments: left, right, center, and -missing-.
+        # If inside a table row, we must let the table logic
+	# do the alignment, however.
+	# 
+
+	my $endstring = '';
+
+	my $align = lc(&Apache::lonxml::get_param('align', $parstack,
+						  $safeeval, undef, 1));
+	if ($align eq 'center') {
+	    $currentstring .= '\begin{center}';
+	    $endstring      = '\end{center}';
+	    if (&is_inside_of($tagstack, "table")) {
+		$currentstring = &center_correction().$currentstring;
+		$endstring    .= &center_end_correction(); 
+	    }
+	}
+	elsif ($align eq 'right') {
+	    $currentstring .= '\begin{flushright}';
+	    $endstring     .= '\end{flushright}';
+	} elsif ($align eq 'left') {
+	    $currentstring .= '\begin{flushleft}';
+	    $endstring     = '\end{flushleft}';
+	} else {
+	
+	}
+	$currentstring .= "\n";   # For human readability.
+	$endstring       = "\n$endstring\n"; # For human readability
+	push(@div_end_stack, $endstring);
+    }
+    return $currentstring;
+}
+
+sub end_div {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    }
+    if ($target eq 'tex') {
+	my $endstring = pop @div_end_stack;
+	$currentstring .= $endstring;
+    }
+    return $currentstring;
+}
+}
+
+#-- <a> tag (end tag required)
+sub start_a {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $href=&Apache::lonxml::get_param('href',$parstack,$safeeval,
+					    undef,1);
+	$currentstring=&Apache::lonenc::encrypt_ref($token,{'href'=>$href});
+        if ($href =~ /\S/) {
+            if ($href !~ m{^https?://}) {
+                my $url=&Apache::lonnet::hreflocation('',$env{'request.filename'});
+                my $linkurl;
+                if ($href =~ m{^/uploaded/}) {
+                    $linkurl = $href;
+                } elsif ($href =~ m{^[^/]}) {
+                    my $path = $url;
+                    $path  =~ s{[^/]*$}{};
+                    $linkurl = $path.$href;
+                }
+                if ($linkurl =~ m{^/uploaded/}) {
+                    if (!&Apache::lonnet::allowed('bre',$linkurl)) {
+                        if (&Apache::lonnet::is_on_map($url)) {
+                            &Apache::lonxml::extlink($linkurl);
+                        }
+                    }
+                }
             }
-           return $currentstring;
+        }
+    }
+    return $currentstring;
+}
+
+sub end_a {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    }
+    if ($target eq 'tex') {
+	my $href =
+	    &Apache::lonxml::get_param('href',$parstack,$safeeval,undef,1);
+	my $name =
+	    &Apache::lonxml::get_param('name',$parstack,$safeeval,undef,1);
+        my $uriprint =
+            &Apache::lonxml::get_param('uriprint',$parstack,$safeeval,undef,1);
+        my $anchorprint =
+            &Apache::lonxml::get_param('anchorprint',$parstack,$safeeval,undef,1);
+	if (($href =~ /\S/) && ($uriprint=~/^on|uriprint|yes|1$/i)) {
+	    $href =~ s/([^\\])%/$1\\\%/g;
+	    # Substitute special symbols... and allow line breaks at each /
+	    #
+	    $href = &Apache::lonxml::latex_special_symbols($href);
+	    $href =~ s/\//\/\\-/g;              # Map / to /\- to allow hyphenation.
+	    $currentstring .= ' ({\tt URI:'.$href.'})';
+	} elsif (($name =~ /\S/) && ($anchorprint=~/^on|anchorprint|yes|1$/i)) {
+	    $currentstring .= ' ({\tt Anchor:'.&Apache::lonxml::latex_special_symbols($name).'})';
+	} else {
+	    $currentstring.='';
+	}	
+    }
+    return $currentstring;
+}
+
+#-- <li> tag (end tag optional)
+sub start_li {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
+	my $value=&Apache::lonxml::get_param('value',$parstack,$safeeval,undef,0);
+	#FIXME need to support types i and I 
+	if ($type=~/disc/) {
+	    $currentstring .= ' \item[$\bullet$] ';
+	} elsif ($type=~/circle/) {
+	    $currentstring .= ' \item[$\circ$] ';
+	} elsif ($type=~/square/) {
+	    $currentstring .= ' \item[$\diamond$] ';
+	} elsif ($type eq '1') {
+	    $currentstring .= ' \item['.($Apache::londefdef::list_index+1).'.]';
+	} elsif ($type eq 'A') {
+	    $currentstring .= ' \item['.('A'..'Z')[$Apache::londefdef::list_index].'.]';
+	} elsif ($type eq 'a') {
+	    $currentstring .= ' \item['.('a'..'z')[$Apache::londefdef::list_index].'.]';
+	} elsif ($value ne '') {
+	    $currentstring .= ' \item['.$value.'] ';
+	} else {
+	    $currentstring .= ' \item ';
+	}  
+	$Apache::londefdef::list_index++;
+    }
+    return $currentstring;
+}
+
+sub end_li {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# In case there's a <p> in the <li>
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];     
+    } 
+    return $currentstring;
+}
+
+#-- <u> tag (end tag required)
+sub start_u {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	&Apache::lonxml::startredirection();
+    } 
+    return $currentstring;
+}
+
+sub end_u {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring=&Apache::lonxml::endredirection();
+	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
+	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
+	$currentstring=~s/(\S)\s*$/$1\}/;		
+    }
+    return $currentstring;
+}
+
+#-- <ul> tag (end tag required)
+sub start_ul {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close off enclosing list.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	my $TeXtype=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
+	$Apache::londefdef::list_index=0;
+	if ($TeXtype eq 'disc') {
+	    $currentstring .= '\renewcommand{\labelitemi}{$\bullet$}'.
+                              '\renewcommand{\labelitemii}{$\bullet$}'. 
+                              '\renewcommand{\labelitemiii}{$\bullet$}'.
+                              '\renewcommand{\labelitemiv}{$\bullet$}';
+	} elsif ($TeXtype eq 'circle') {
+	    $currentstring .= '\renewcommand{\labelitemi}{$\circ$}'.
+                              '\renewcommand{\labelitemii}{$\circ$}'. 
+                              '\renewcommand{\labelitemiii}{$\circ$}'.
+                              '\renewcommand{\labelitemiv}{$\circ$}';
+	} elsif ($TeXtype eq 'square') {
+	    $currentstring .= '\renewcommand{\labelitemi}{$\diamond$}'.
+                              '\renewcommand{\labelitemii}{$\diamond$}'. 
+                              '\renewcommand{\labelitemiii}{$\diamond$}'.
+                              '\renewcommand{\labelitemiv}{$\diamond$}';
+	}
+	$currentstring .= '\strut \begin{itemize}';  
+    } 
+    return $currentstring;
+}
+
+sub end_ul {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	$currentstring = '\end{itemize} \renewcommand{\labelitemi}{$\bullet$}'.
+                               '\renewcommand{\labelitemii}{$\bullet$}'. 
+                               '\renewcommand{\labelitemiii}{$\bullet$}'.
+                               '\renewcommand{\labelitemiv}{$\bullet$}\strut ';  
+    } 
+    return $currentstring;
+}
+
+#-- <menu> tag (end tag required)
+sub start_menu {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$currentstring = " \\begin{itemize} ";  
+    } 
+    return $currentstring;
+}
+
+sub end_menu {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	$currentstring = " \\end{itemize}";  
+    } 
+    return $currentstring;
+}
+
+#-- <dir> tag (end tag required)
+sub start_dir {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# In case there's a <p> prior to the list.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	$currentstring .= " \\begin{itemize} ";  
+    } 
+    return $currentstring;
+}
+
+sub end_dir {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	$currentstring = " \\end{itemize}";  
+    } 
+    return $currentstring;
+}
+
+#-- <ol> tag (end tag required)
+sub start_ol {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# In case there's a <p> prior to the list.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	$Apache::londefdef::list_index=0;
+	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
+	if ($type eq '1') {
+	    $currentstring .= '\renewcommand{\labelenumi}{\arabic{enumi}.}'.
+                              '\renewcommand{\labelenumii}{\arabic{enumii}.}'. 
+                              '\renewcommand{\labelenumiii}{\arabic{enumiii}.}'.
+                              '\renewcommand{\labelenumiv}{\arabic{enumiv}.}';
+	} elsif ($type eq 'A') {
+	    $currentstring .= '\renewcommand{\labelenumi}{\Alph{enumi}.}'.
+                              '\renewcommand{\labelenumii}{\Alph{enumii}.}'. 
+                              '\renewcommand{\labelenumiii}{\Alph{enumiii}.}'.
+                              '\renewcommand{\labelenumiv}{\Alph{enumiv}.}';
+	} elsif ($type eq 'a') {
+	    $currentstring .= '\renewcommand{\labelenumi}{\alph{enumi}.}'.
+                              '\renewcommand{\labelenumii}{\alph{enumii}.}'.
+                              '\renewcommand{\labelenumiii}{\alph{enumiii}.}'.
+                              '\renewcommand{\labelenumiv}{\alph{enumiv}.}';
+	} elsif ($type eq 'i') {
+	    $currentstring .= '\renewcommand{\labelenumi}{\roman{enumi}.}'.
+                              '\renewcommand{\labelenumii}{\roman{enumii}.}'.
+                              '\renewcommand{\labelenumiii}{\roman{enumiii}.}'.
+                              '\renewcommand{\labelenumiv}{\roman{enumiv}.}';
+	} elsif ($type eq 'I') {
+	    $currentstring .= '\renewcommand{\labelenumi}{\Roman{enumi}.}'.
+                              '\renewcommand{\labelenumii}{\Roman{enumii}.}'.
+                              '\renewcommand{\labelenumiii}{\Roman{enumiii}.}'.
+                              '\renewcommand{\labelenumiv}{\Roman{enumiv}.}';
 	}
-#-- <hr> tag
-        sub start_hr {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "\\hline ";
-	    } 
-           return $currentstring;
-	}
-        sub end_hr {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	    } 
-           return $currentstring;
-	}
-#-- <a> tag
-        sub start_a {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-	    }
-           return $currentstring;
-	}
-        sub end_a {
-	    my ($target,$token,$tagstack,$stackref) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-                my  $tempor_var = $stackref->[$#$stackref];
-		if (index($tempor_var,'name') != -1 ) {
-		    $tempor_var =~ s/name=([^,]*),/$1/g;
-#	        $currentstring .= " \\label{$tempor_var}";
-	        } elsif (index($tempor_var,'href') != -1 ) {
-		    $tempor_var =~ s/href=([^,]*),/$1/g;
-	        $currentstring .= " \\ref{$tempor_var}";
-	        }
+	$currentstring .= '\strut \begin{enumerate}';  
+    } 
+    return $currentstring;
+}
+
+sub end_ol {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	$currentstring = '\end{enumerate}\renewcommand{\labelenumi}{\arabic{enumi}.}'.
+                                        '\renewcommand{\labelenumii}{\arabic{enumii}.}'.
+                                        '\renewcommand{\labelenumiii}{\arabic{enumiii}.}'.
+                                        '\renewcommand{\labelenumiv}{\arabic{enumiv}.}\strut ';  
+    } 
+    return $currentstring;
+}
+
+#-- <dl> tag (end tag required)
+sub start_dl {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# In case there's a <p> unclosed prior to the list.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\begin{description}';
+	$Apache::londefdef::DL++;
+	push(@Apache::londefdef::description,[]);
+	$Apache::londefdef::DD[$Apache::londefdef::DL]=0;
+	$Apache::londefdef::DT[$Apache::londefdef::DL]=0;
+	$Apache::londefdef::seenDT[$Apache::londefdef::DL]=0;
+    } 
+    return $currentstring;
+}
+
+sub end_dl {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
+	if ($Apache::londefdef::DD[-1]) { &end_dd(@_); }
+	foreach my $element (@{$Apache::londefdef::description[-1]}) {
+	    $currentstring.=' '.$element.' ';
+	}
+	pop(@Apache::londefdef::description);
+	$currentstring.='\end{description}';  
+	delete($Apache::londefdef::DD[$Apache::londefdef::DL]);
+	delete($Apache::londefdef::DT[$Apache::londefdef::DL]);
+	delete($Apache::londefdef::seenDT[$Apache::londefdef::DL]);
+	$Apache::londefdef::DL--;
+    } 
+    return $currentstring;
+}
+
+#-- <dt> tag (end tag optional)
+sub start_dt {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring='';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
+	if ($Apache::londefdef::DD[-1]) { &end_dd(@_); }
+	&Apache::lonxml::startredirection();
+	$Apache::londefdef::DT[-1]++;
+	$Apache::londefdef::seenDT[-1]=1;
+    } 
+    return $currentstring;
+}
+
+sub end_dt {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } elsif ($target eq 'tex') {
+	if ($Apache::londefdef::DT[-1]) {
+	    my $data=&item_cleanup();
+	    push(@{$Apache::londefdef::description[-1]},'\item['.$data.'] \strut \vskip 0mm');
+	    $Apache::londefdef::DT[-1]--;
+	}
+    } 
+    return $currentstring;
+}
+
+sub item_cleanup {
+    my $item=&Apache::lonxml::endredirection();
+    $item=~s/\\begin{center}//g;
+    $item=~s/\\end{center}//g;
+    return $item;
+}
+
+#-- <dd> tag (end tag optional)
+sub start_dd {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	if ($Apache::londefdef::DT[-1]) { &end_dt(@_); }
+	if ($Apache::londefdef::DD[-1]) { &end_dd(@_);}
+	if (!$Apache::londefdef::seenDT[-1]) {
+	    push(@{$Apache::londefdef::description[-1]},'\item[\strut] \strut \vskip 0mm ');
+	}
+	push(@{$Apache::londefdef::description[-1]},'');
+	$Apache::londefdef::description[-1]->[-1].=' \strut ';
+	$Apache::londefdef::DD[-1]++;
+	&Apache::lonxml::startredirection();
+    } 
+    return $currentstring;
+}
+
+sub end_dd {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    }  elsif ($target eq 'tex') {
+	$Apache::londefdef::description[-1]->[-1].=
+	    &Apache::lonxml::endredirection().' \vskip 0mm ';
+	$Apache::londefdef::DD[-1]--;
+    }
+    return $currentstring;
+}
+
+#-- <table> tag (end tag required)
+#       <table> also ends any prior <p> that is not closed.
+#               but, unless I allow <p>'s to nest, that's the
+#               only way I could think of to allow <p> in 
+#               <tr> <th> bodies
+#
+#list of supported attributes: border,width,TeXwidth,TeXtheme
+#                              align
+sub start_table {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $textwidth = '';
+    my $currentstring = &end_p();
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } elsif ($target eq 'tex') {
+	&disable_para();	# Can't have paras in a table.
+
+
+	#  New table code:
+
+	#  Get the parameters that we can do something about:
+
+	my $border = &Apache::lonxml::get_param('border', $parstack, $safeeval, undef, 0);
+	my $width  = &Apache::lonxml::get_param('TeXwidth', $parstack, $safeeval, undef, 0);
+	my $theme  = &Apache::lonxml::get_param('TeXtheme', $parstack, $safeeval, undef, 0);
+	my $align  = &Apache::lonxml::get_param('align', $parstack, $safeeval, undef, 0);
+        my $cell_border = &Apache::lonxml::get_param('rules', $parstack, $safeeval, undef, 0);
+
+	# The only thing that needs any figuring out is the width.. and then only if it is
+	# a percent. If not it's assumed to be some valid TeX measurement unit e.g. 3.0cm
+	#
+
+	my $table = new Apache::lontable();
+        if ((defined $border) && ($border > 0)) {
+        #    &Apache::lonnet::logthis("Turning on table borders: $border");
+            $table->table_border(1);
+            if ($cell_border ne 'none') {
+                $table->cell_border(1); # html specs that border turns on both...unless rules='none'.
             }
-           return $currentstring;
+        }
+        # Only all or nothing for cell borders for now:
+
+        if ((defined $cell_border) && ($cell_border ne 'none')) {
+        #    &Apache::lonnet::logthis("Turning on cell borders: $cell_border");
+            $table->cell_border(1);
+        }
+	if (defined $theme) {
+	    $table->theme($theme);
+	}
+	if (defined $align) {
+	    $table->alignment($align);
+	}
+
+	# Missing width is most of page width
+
+	if (!(defined $width)) {
+	    $width = '70%';
+	}
+
+	# If a percentage, need to calculate what this means in terms of
+	# page width:
+	
+	if ($width =~ /%$/) {
+	    my $textwidth = &recalc($env{'form.textwidth'});  # Page width in mm.
+	    $width =~ s/%//;
+	    $width = $width * $textwidth / 100.0;
+	    $width .= " mm";
+	    $table->width($width);
+	}
+
+	push(@Apache::londefdef::table, $table);
+        $currentstring.=' \keephidden{NEW TABLE ENTRY}';
+
+	#--------------------------------------------------------
+	#  Old table code here.
+	#--------------------------------------------------------
+
+
+	if (0) {
+	push(@Apache::londefdef::table, {}); 
+	$Apache::londefdef::table[-1]{'row_number'} = -1;
+        #maximum table's width (default coincides with text line length)
+	if ($#Apache::londefdef::table==0) {
+	    $textwidth=&recalc($env{'form.textwidth'}); #result is always in mm
+	    $textwidth=~/(\d+\.?\d*)/;
+	    $textwidth=0.85*$1; #accounts "internal" LaTeX space for table frame
+	} else {
+	    if ($Apache::londefdef::table[-2]{'TeXlen'}[$Apache::londefdef::table[-2]{'row_number'}][$Apache::londefdef::table[-2]{'counter_columns'}]=~/\d/) {
+		#the maximum width of nested table is determined by LATeX width of parent cell
+		$textwidth=$Apache::londefdef::table[-2]{'TeXlen'}[$Apache::londefdef::table[-2]{'row_number'}][$Apache::londefdef::table[-2]{'counter_columns'}]; 
+	    } else {
+              #try to use all space not used before (minus 5% for LaTeX table internal) - rather silly
+		$textwidth=$Apache::londefdef::table[-2]{'width'};
+		for (my $i=0;$i<$Apache::londefdef::table[-2]{'counter_columns'};$i++) {
+		    $textwidth=$textwidth-$Apache::londefdef::table[-2]{'TeXlen'}[0][$i];
+		}
+	    }
+	}
+
+	# width either comes forced from the TeXwidth or the width parameters.
+	# in either case it can be a percentage or absolute width.
+	# in the width case we ignore absolute width 
+	my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+	if (!defined($TeXwidth)) {
+	    my $htmlwidth = &Apache::lonxml::get_param('width',$parstack,
+						       $safeeval,undef,1);
+	    if ($htmlwidth =~ /%/) {
+		$TeXwidth = $htmlwidth;
+	    } else { 
+		$TeXwidth = $textwidth;
+	    }
 	}
-#-- <li> tag
-        sub start_li {
-	    my ($target,$token,$tagstack,$stackref) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-                my  $tempor_var = $stackref->[$#$stackref];
-                if (index($tempor_var,'circle') != -1 ) {
-	          $currentstring .= " \\item[o] ";
-	        } elsif (index($tempor_var,'square') != -1 ) {
-	               $currentstring .= " \\item[$\Box$] ";
-	        } elsif ($tempor_var ne '') { 
-		       $_ = $tempor_var;
-                       m/my\s*([^=]*)=/;
-		       $currentstring .= " \\item[$1] ";
+	# if the width is specified as a % it is converted to an absolute width.
+	# otherwise.. just plugged right in the hash
+
+	if ($TeXwidth=~/%/) {
+	    $TeXwidth=~/(\d+)/;
+            $Apache::londefdef::table[-1]{'width'}=$1*$textwidth/100;
+	} else {
+	    $Apache::londefdef::table[-1]{'width'}=$TeXwidth;
+	}
+        #  In the end, however the table width cannot be wider than $textwidth...
+	
+	if ($Apache::londefdef::table[-1]{'width'} > $textwidth) {
+	    $Apache::londefdef::table[-1]{'width'} = $textwidth;
+	}
+        #table's border
+	my $border = &Apache::lonxml::get_param('border',$parstack,$safeeval); 
+        my $permission=&Apache::lonxml::get_param('TeXDropEmptyColumns',$parstack,$safeeval,undef,0);
+	unless (defined $border) { $border = 0; }
+	if ($border) { 
+	    $Apache::londefdef::table[-1]{'hinc'} = '\hline '; 
+	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
+	    $Apache::londefdef::table[-1]{'vvinc'} = '|';
+	} else {
+	    $Apache::londefdef::table[-1]{'hinc'} = ''; 
+	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
+	    $Apache::londefdef::table[-1]{'vvinc'} = '';
+	}
+	if ($#Apache::londefdef::table==0) {
+	    #    Note that \newline seems to destroy the alignment envs.
+	    # $Apache::londefdef::table[-1]{'output'}='\strut\newline\strut\setlength{\tabcolsep}{1 mm}';
+	    $Apache::londefdef::table[-1]{'output'}='\strut'.'\\\\'."\n".'\strut\setlength{\tabcolsep}{1 mm}';
+	}
+	$Apache::londefdef::table[-1]{'output'}.=' \noindent \begin{tabular} ';
+        $Apache::londefdef::table[-1]{'TeXlen'}=[];
+        $Apache::londefdef::table[-1]{'objectlen'}=[];
+        $Apache::londefdef::table[-1]{'objectsignal'}=[];
+        $Apache::londefdef::table[-1]{'maxlen'}=[];
+        $Apache::londefdef::table[-1]{'minlen'}=[];
+        $Apache::londefdef::table[-1]{'content'}=[];
+        $Apache::londefdef::table[-1]{'align'}=[];
+        $currentstring.=' \keephidden{NEW TABLE ENTRY}';
+    }
+
+    }
+    return $currentstring;
+}
+ 
+sub end_table {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+
+
+	#  New table code:
+
+	my $table = pop(@Apache::londefdef::table);
+	my $t     = $table->generate();
+	$currentstring = $t->generate_string();
+	&enable_para();
+	#--------------------------------------------------------------
+	#  Old table code:
+	#--------------------------------------------------------------
+
+	if (0) {
+
+	my $border =  &Apache::lonxml::get_param('border',$parstack,$safeeval);
+	my $inmemory = '';
+	my $output = '';
+	my $WARNING='';
+        #width of columns from TeXwidth attributes
+
+	# Protect against unbalanced </table> tag.
+
+	if (scalar(@Apache::londefdef::table) > 0) {
+
+	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+	    for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
+		if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]<$Apache::londefdef::table[-1]{'TeXlen'}[$in][$jn]) {
+		    $Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]=$Apache::londefdef::table[-1]{'TeXlen'}[$in][$jn];
+		}	
+	    }
+	}
+        #free space and number of empty columns
+	my ($available_space,$empty_columns)=($Apache::londefdef::table[-1]{'width'},0);
+	if ($#Apache::londefdef::table ne 0) {$available_space=0.9*$available_space;} 
+	for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
+	    if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]==0) {
+		$empty_columns++;
+	    } else {
+		$available_space=$available_space-$Apache::londefdef::table[-1]{'TeXlen'}[0][$jn];
+	    }
+	}
+
+        #boundaries for contents columns
+	my @min_len=();#columns can not be narrower 
+	my @max_len=();#maximum length of column
+	my $avg_max;
+	my $avg_min;
+	my $counter_cols = $Apache::londefdef::table[-1]{'counter_columns'};
+	for (my $jn=0;$jn<=$counter_cols; $jn++) {
+		my ($localmin,$localmax)=(0,0);
+		for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+		    if ($localmin<$Apache::londefdef::table[-1]{'minlen'}[$in][$jn]) {
+			$localmin=$Apache::londefdef::table[-1]{'minlen'}[$in][$jn];
+		    }
+		    if ($localmax<$Apache::londefdef::table[-1]{'maxlen'}[$in][$jn]) {
+			$localmax=$Apache::londefdef::table[-1]{'maxlen'}[$in][$jn];
+		    }
+		}
+		push @min_len, $localmin;
+		push @max_len, $localmax;
+		$avg_max = $localmax + $avg_max;
+		$avg_min = $localmin + $avg_min;
+	}
+	# Does not really matter what the average max/min are if there are no cols.
+	# and this prevents div 0 in that case.
+
+	if ($counter_cols != 0) {
+	    $avg_max = $avg_max/$counter_cols;
+	    $avg_min = $avg_min/$counter_cols;
+	}
+
+
+	#  I don't think the below is needed.. but just in case:
+
+	if ($avg_min > $avg_max) {
+	    my $temp = $avg_min;
+	    $avg_min = $avg_max;
+	    $avg_max = $temp;
+	}
+
+
+	for (my $jn=0;$jn<=$counter_cols;$jn++) {
+	    my $localmin=0,;
+	    for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+		if ($localmin<$Apache::londefdef::table[-1]{'objectlen'}[$in][$jn]) {
+		    $localmin=$Apache::londefdef::table[-1]{'objectlen'}[$in][$jn];
+		}
+	    }
+	    if ($max_len[$jn]<$localmin) {
+		$max_len[$jn]=$localmin;
+	    	$Apache::londefdef::table[-1]{'objectsignal'}[$jn]=1;
+	    }#object size is bigger
+	    if ($min_len[$jn]<$localmin) {
+		$min_len[$jn]=$localmin;
+		$Apache::londefdef::table[-1]{'objectsignal'}[$jn]=1;
+	    }#object size is bigger
+	    if ($Apache::londefdef::table[-1]{'TeXlen'}[0][$jn]!=0) {
+		$min_len[$jn]=0;
+		$max_len[$jn]=0;
+	    }
+	    #  Spans seem to be really bothered by max/min = 0.  So if we have one
+	    #  make it an average joe max/min.
+	    
+	    if ($max_len[$jn] == 0) {
+		$max_len[$jn] = $avg_max;
+	    }
+	    if ($min_len[$jn] == 0) {
+		$min_len[$jn] = $avg_min;
+	    }
+
+	}
+       #final adjustment of column width
+	my @fwidth=@{$Apache::londefdef::table[-1]{'TeXlen'}[0]};#final width array
+	my @adjust=();
+        #step 1. adjustment by maximum value
+	my $space_needed=0;
+	for (my $jn=0;$jn<=$#max_len;$jn++) {
+	    $space_needed=$space_needed+$max_len[$jn];
+	}
+	if ($space_needed<=$available_space) {
+
+	    for (my $jn=0;$jn<=$#max_len;$jn++) {
+		if ($fwidth[$jn]==0) {
+		    $fwidth[$jn]=$max_len[$jn];
+		}
+	    }
+	} else {
+        #step 2. adjustment by minimum value (estimation)
+	    $space_needed=0;
+	    for (my $jn=0;$jn<=$#min_len;$jn++) {
+		$space_needed+=$min_len[$jn];
+	    }
+	    if ($space_needed>$available_space) {
+		$WARNING=' \textbf{NOT ENOUGH SPACE FOR TABLE} ';
+		for (my $jn=0;$jn<=$#max_len;$jn++) {
+		    if ($fwidth[$jn]==0) {
+			$fwidth[$jn]=$min_len[$jn];
+		    }
+		}
+		#check if we have objects which can be scaled
+		my $how_many_to_scale=0;
+		my @to_scale=();
+		for (my $jn=0;$jn<=$#max_len;$jn++) {
+		    if ($Apache::londefdef::table[-1]{'objectsignal'}[$jn] eq '1') {
+			$how_many_to_scale++;
+			push @to_scale, $jn;
+		    }
+		}
+		if ($how_many_to_scale>0) {
+		    my $space_to_adjust=($space_needed-$available_space)/$how_many_to_scale;
+		    foreach my $jn (@to_scale) {
+			for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+			    $Apache::londefdef::table[-1]{'content'}[$in][$jn]=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/;
+			    if ($1 ne '') {
+				my $current_length=&recalc($1);
+				$current_length=~/(\d+\.?\d*)/;
+				$current_length=$current_length-$space_to_adjust;
+				$Apache::londefdef::table[-1]{'content'}[$in][$jn]=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/width=$current_length mm/;
+			    }
+			    $Apache::londefdef::table[-1]{'content'}[$in][$jn]=~m/\[(\d+\.?\d*)\s*mm\]/;
+			    if ($1 ne '') {
+				my $current_length=$1;
+				$current_length=$current_length-$space_to_adjust;
+				$Apache::londefdef::table[-1]{'content'}[$in][$jn]=~s/\[(\d+\.?\d*)\s*mm\]/\[$current_length mm\]/;
+			    }				
+			}
+			$fwidth[$jn]=$fwidth[$jn]-$space_to_adjust;
+		    }
+		}
+	    } else {
+	      #step 3. adjustment over minimal + corrections
+		my $enlarge_coef=$available_space/$space_needed;
+		my $acsessive=0;
+		for (my $jn=0;$jn<=$#min_len;$jn++) {
+		    $adjust[$jn]=$min_len[$jn]*$enlarge_coef;
+		    if ($adjust[$jn]>$max_len[$jn]) {
+			$fwidth[$jn]=$max_len[$jn];
+			$acsessive=$acsessive+$adjust[$jn]-$max_len[$jn];
+			$adjust[$jn]=0;
+
+		    }
+		}
+		if ($acsessive>0) {
+		#we have an excess of space and can redistribute it
+		    my $notempty_columns=0;
+		    for (my $jn=0;$jn<=$#min_len;$jn++) {
+			if ($adjust[$jn]!=0) {
+			    $notempty_columns++;
+			}
+		    }
+		    my $per_column=$acsessive/$notempty_columns;
+		    for (my $jn=0;$jn<=$#min_len;$jn++) {
+			if ($adjust[$jn]!=0) {
+			    $adjust[$jn]+=$per_column;
+			    $fwidth[$jn]=$adjust[$jn];
+			}
+		    }
 		} else {
-		    $currentstring .= " \\item ";
-	        }  
-	    } 
-	   return $currentstring;
-	}
-        sub end_li {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } 
-	   return $currentstring;
-	}
-#-- <u> tag
-        sub start_u {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= "{\\underline ";
-	    } 
-           return $currentstring;
-	}
-        sub end_u {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-	        $currentstring .= " }";
-            }
-           return $currentstring;
+		    for (my $jn=0;$jn<=$#min_len;$jn++) {
+			$fwidth[$jn]=$adjust[$jn];
+		    }
+		}
+	    }
+	}
+        # use all available width or specified width as if not specified,
+	# the specified width gets defaulted to the available width.
+
+	my $current=0; 
+	for (my $i=0;$i<=$#fwidth;$i++) {  
+	    $current+=$fwidth[$i];
+	}
+	if ($current == 0) {
+            $current = $Apache::londefdef::table[-1]{'width'};
+        }
+	my $coef=$Apache::londefdef::table[-1]{'width'}/$current;
+	for (my $i=0;$i<=$#fwidth;$i++) {  
+	    $fwidth[$i]*=$coef;
+	}
+        #removing of empty columns if allowed
+        my $permission=&Apache::lonxml::get_param('TeXDropEmptyColumns',$parstack,$safeeval,undef,0);
+	if ($permission eq 'yes') {
+	    my @cleaned_table=();
+            my @cleaned_header=();
+	    my $colind=0;
+	    for (my $jn=0;$jn<=$Apache::londefdef::table[-1]{'counter_columns'};$jn++) {
+		if ($fwidth[$jn]!=0) {
+		    #we need to copy column
+		    for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+			$cleaned_table[$in][$colind]=$Apache::londefdef::table[-1]{'content'}[$in][$jn];
+			$cleaned_header[$colind]=$fwidth[$jn];
+		    }
+		    $colind++;
+		}
+	    }
+	    $Apache::londefdef::table[-1]{'content'}=\@cleaned_table;
+	    @fwidth=@cleaned_header;
+	}
+
+
+	#construct header of the table
+	my $header_of_table = '{'.$Apache::londefdef::table[-1]{'vvinc'};
+	for (my $in=0;$in<=$#fwidth;$in++) {
+	    $header_of_table.='p{'.$fwidth[$in].' mm}'.$Apache::londefdef::table[-1]{'vvinc'};
 	}
-#-- <ul> tag
-        sub start_ul {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\begin{itemize}';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_ul {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\end{itemize}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <menu> tag
-        sub start_menu {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\begin{itemize} ";  
-	    } 
-	   return $currentstring;
-	}
-        sub end_menu {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\end{itemize}";  
-	    } 
-	   return $currentstring;
-	}
-#-- <dir> tag
-        sub start_dir {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\begin{itemize} ";  
-	    } 
-	   return $currentstring;
-	}
-        sub end_dir {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\end{itemize}";  
-	    } 
-	   return $currentstring;
-	}
-#-- <ol> tag
-        sub start_ol {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\begin{enumerate}';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_ol {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\end{enumerate}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <dl> tag
-        sub start_dl {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\begin{description}';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_dl {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\end{description}';  
-	    } 
-	   return $currentstring;
-	}
-#-- <dt> tag
-        sub start_dt {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = '\item[';  
-	    } 
-	   return $currentstring;
-	}
-        sub end_dt {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } elsif ($target eq 'tex') {
-              $currentstring = ']';  
-	    } 
-	   return $currentstring;
-	}
-#-- <dd> tag
-        sub start_dd {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } 
-	   return $currentstring;
-	}
-        sub end_dd {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];    
-            } 
-	   return $currentstring;
-	}
-#-- <table> tag
-        sub start_table {
-	    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-		my $border = &Apache::lonxml::get_param('border',$parstack,$safeeval);
-		my $tabletext=&Apache::lonxml::get_all_text("/table",$$parser[$#$parser]);
-		my %mystyle;
-		$tabletext = &Apache::lonxml::xmlparse('tex',$tabletext,'',%mystyle);       
-		unless (defined $border) { $border = 0; }
-		my $hinc = '';
-                my $vinc = '';   
-		my $vvinc = '';
-		if ($border) { $hinc = '\hline '; $vinc =  '&'; $vvinc =  '|';}
-		my @raws = ();
-		my @columns = ();
-		my $counter_columns;
-#serch row
-		$_ = $tabletext;
-		while (m/<tr\s*([^>]*)>/) {
-		    push @raws,$1;
-                    $tabletext =~ s/<tr\s*([^>]*)>/$hinc/;
-#serch and convert column
-		    my $boundary = index($tabletext,'</tr>',0);
-		    my $textchunk = substr($tabletext,0,$boundary); 
-		    $_ = $textchunk;
-		    $counter_columns = 0;
-		    while (m/<td\s*([^>]*)>/) {
-			push @columns,$1;
-			$counter_columns++;
-			$textchunk =~ s/<\/td>\s*<td\s*([^>]*)>/$vinc/;
-			$textchunk =~ s/<td\s*([^>]*)>//;
-			$textchunk =~ s/<\/td>//;
-			$_ = $textchunk;
-		    }			
-		    substr($tabletext,0,$boundary) = $textchunk;
-#convert row
-		    $tabletext =~ s/<\/tr>/\\\\/;
-		    $_ = $tabletext;
-		}
-		my $default_value = '';
-		if ($raws[1] eq 'left') {
-		    $default_value = 'l';
-		} elsif ($raws[1] eq 'center') {
-		    $default_value = 'c';
-		} elsif ($raws[1] eq 'right') {
-		    $default_value = 'r';
+	$header_of_table .= '}';
+
+	#fill the table
+	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
+	    my $have_rowspan = 0;
+	    for (my $jn=0;$jn<=$#fwidth;$jn++) {
+
+		#-----------------------------------------------------------
+                #   I think this order of doing things will ensure that
+		#   single rowspan, columspan and combined row/colspans will
+                #   work correctly.  LaTeX is delicate here.
+		#    RF.
+		
+		# Start a rowspan if necessary:
+		
+		my $primary_col_width = $fwidth[$jn]; # Width of primary column.
+		my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
+		my $colspan = $Apache::londefdef::table[-1]{'colspan'}[$in][$jn];
+		#
+		#  Do the appropriate magic if this has a colspan
+		# 
+		
+		my $border_char = "";
+		if ($border) {
+		    $border_char = "|";
+		}
+		my $spanwidth = 0;
+		if ($colspan > 1) {
+		    for (my $spancol = $jn; $spancol < $jn + $colspan; $spancol++) {
+			$spanwidth += $fwidth[$spancol];
+		    }
+		    $output .= '\multicolumn{'.
+			$colspan
+			."}";
+		    if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
+			$output .= '{'.$border_char.'c'.$border_char.'}{';
+		    } elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
+			$output .= '{'.$border_char.'r'.$border_char.'}{';
+		    }
+		    else {
+			$output .= '{'.$border_char."p{$spanwidth mm}".$border_char.'}{';
+		    }
+		    
 		} else {
-		     $default_value = 'c';
+		    $spanwidth = $primary_col_width; # If no span width will be just colwidth
 		}
-		my $header_of_table = '{'.$vvinc;
-		my $in;
-		for ($in=0;$in<=$counter_columns;$in++) {
-		    if ($columns[$in] eq 'left') {
-			$header_of_table .= 'l'.$vvinc;
-		    } elsif ($columns[$in] eq 'center') {
-			$header_of_table .= 'c'.$vvinc;
-		    } elsif ($columns[$in] eq 'right') {
-			$header_of_table .= 'r'.$vvinc;
+
+		# Rowspan... if colspan is 1, and there's an alignment we'll need
+		# to kick in a multicolumn in order to get the alignment spec.
+		# this must precede the multirow or LaTex gets quite upset.
+		# Naturally if colspan > 1 we've already done that above ^
+		#
+		my $multirow_aligned = 0;
+		if ($rowspan > 1) {
+		    if ($colspan == 1) {
+			if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
+			    $output .= '\multicolumn{1}{'.$border_char.'c'.$border_char.'}{';
+			    $multirow_aligned = 1;
+			} elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
+			    $output .= '\multicolumn{1}{'.$border_char.'r'.$border_char.'}{';
+			    $multirow_aligned = 1;
+			}
+		    }
+		    $have_rowspan++;
+		    if ($multirow_aligned) {
+			$output .= '\multirow{'.$rowspan.'}[0]{*}{';
 		    } else {
-		       $header_of_table .= $default_value.$vvinc;
+			$output .= '\multirow{'.$rowspan."}[0]{$spanwidth mm}{";
+		    }
+		    
+		    $Apache::londefdef::table[-1]{'content'}[$in][$jn] =~
+			s{^\s*\\par\s*}{};
+		    $Apache::londefdef::table[-1]{'content'}[$in][$jn] =~
+			s{\s*\\vskip\s*0pt\s*$}{};
+			  
+		    #
+		    # If we did not throw in a multicolumn to align, then add 
+		    # an extra {
+		    # so we close correctly without having to keep additional state
+		    # around
+		    #
+		    if (!$multirow_aligned) {
+			$output .= '{';
 		    }
 		}
-		$header_of_table .= '}';
-		$currentstring .= '\begin{tabular}'.$header_of_table.$tabletext.$hinc.'\end{tabular}';
-	    } 
-	   return $currentstring;
-	}
-        sub end_table {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    }
-	   return $currentstring;
-	}
-#-- <img> tag
-        sub start_img {
-	    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-            $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
-                                        $token->[2]->{'src'};
-            my $currentstring = '';
-
-	    if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-	      my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval);
-	      my $file;
-	      my $path;
-              if ($src =~ m!(.*)/([^/]*)$!) {
-		$file = $2;
-		$path = $1;
-		if ($path=~m:^/:) {
-		  $path = '/home/httpd/html'.$path;
-		} elsif ($path =~ /^\./) {
-		  $path = $Apache::lonxml::pwd[-1].'/'.$path;
-		} else {
-		  #else it is a full url don't print
-		  $path = undef;
+		if (($rowspan eq '^') || ($rowspan eq '_')) {
+		    $have_rowspan++;
+		}
+		    #--------------------------------------------------------------
+
+
+		# For right and center alignment of single cells.
+		# we are going to use a multicolumn with a span of 1 to specify alignment.
+		#
+		if ($colspan == 1  && $rowspan == 1) {
+		    if ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') {
+			$output .= '\multicolumn{1}{'.$border_char.'c'.$border_char.'}{';
+		    } elsif ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r') {
+			$output .= '\multicolumn{1}{'.$border_char.'r'.$border_char.'}{';
+		    }
+		}
+
+		$output.=$Apache::londefdef::table[-1]{'content'}[$in][$jn];
+
+		if (($colspan == 1 && $rowspan == 1)   &&
+		    (($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'c') ||
+		     ($Apache::londefdef::table[-1]{'align'}[$in][$jn] eq 'r'))) {
+		    $output .= '}';
+		}
+
+		# Close off any open multirow:
+		
+		if ($rowspan > 1) {
+		    $output .= '}}';
 		}
-	      } else {
-		$path = $Apache::lonxml::pwd[-1];
-		$file = $src;
-	      }
-	      $file=~s/(\.gif|\.jpg)$/\.eps/;
-	      if ($path) {
-		$currentstring = '\graphicspath{{'.$path.'/}}\fbox{\includegraphics{'.$file.'}}';
-	      } else {
-		$currentstring = 'See the image at \tt{'.$src.'}';
-	      }
-	    }
-	    return $currentstring;
-	}
-        sub end_img {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];
-	    } elsif ($target eq 'tex') {
-              $currentstring = '';
-	    }
-	   return $currentstring;
-	}
-#-- <applet> tag
-
-        sub start_applet {
-	    my ($target,$token) = @_;
-              $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=   
-                                        $token->[2]->{'code'};
-              $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
-                                        $token->[2]->{'archive'};
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\begin{figure} ";
-	    } 
-	   return $currentstring;
+		#  Close off the colspan...
+		#
+		if ($colspan > 1)  {
+		    $output .= '}';
+		    $jn += $colspan-1; # Adjust for number of rows really left.
+		}
+                if ($jn!=$#fwidth) {$output.=' '.$Apache::londefdef::table[-1]{'vinc'};}
+	    }
+	    #  If have_rowspan > 0, and borders are on, then 
+	    #  we need to do more than put an \hline at the bottom of row.
+	    #  we need to do the appropriate \cline to ensure that
+	    #  the spanned rows don't have \hlines through them.
+
+	    if (($Apache::londefdef::table[-1]{'hinc'} =~ /\\hline/) && $have_rowspan) {
+		$output .= ' \\\\ ';
+		for (my $jn=0; $jn<=$#fwidth;$jn++) {
+		    my $rowspan = $Apache::londefdef::table[-1]{'rowspan'}[$in][$jn];
+		    if ($rowspan ne "^") {
+			if (($rowspan <= 1) || ($rowspan eq '_')) {
+			    my $column = $jn+1;
+			    $output .= '\cline{'.$column.'-'.$column.'} ';
+			}
+		    }
+		}
+
+	    } else {
+		$output.=' \\\\ '.$Apache::londefdef::table[-1]{'hinc'}.' ';
+	    }
 	}
-sub end_applet {
+	# Note that \newline destroys alignment env's produced  by e.g. <div>
+	# $Apache::londefdef::table[-1]{'output'} .= $header_of_table.$Apache::londefdef::table[-1]{'hinc'}.$output.'\end{tabular}\strut\newline\strut ';
+	$Apache::londefdef::table[-1]{'output'} .= $header_of_table.$Apache::londefdef::table[-1]{'hinc'}.$output.'\end{tabular}\strut'.'\\\\'."\n".'\strut ';
+	if ($#Apache::londefdef::table > 0) {	    
+	    my $inmemory = $Apache::londefdef::table[-1]{'output'};
+	    # Figure out max/and min width  by summing us and then
+	    # apply that to the current column of the table we nest in
+	    # if it's larger than the current width or the current width
+	    # is undefined.
+	    #
+	    my $min_nested_width = 0;
+	    my $max_nested_width = 0;
+	    for (my $col = 0; $col <= $Apache::londefdef::table[-1]{'counter_columns'}; $col++) {
+		$min_nested_width +=  $min_len[$col];
+		$max_nested_width +=  $max_len[$col];
+		
+	    }
+	    # Fudge in an extra 5 mm for borders etc:
+	    
+	    $min_nested_width += 5;
+	    $max_nested_width += 5;
+
+	    my $outer_column = $Apache::londefdef::table[-2]{'counter_columns'};
+	    my $outer_row    = $Apache::londefdef::table[-2]{'row_number'};
+	    if ($min_nested_width > $Apache::londefdef::table[-2]{'minlen'}[$outer_row][$outer_column]) {
+		$Apache::londefdef::table[-2]{'minlen'}[$outer_row][$outer_column] = $min_nested_width;
+	    }
+	    if ($max_nested_width > $Apache::londefdef::table[-2]{'maxlen'}[$outer_row][$outer_column]) {
+		$Apache::londefdef::table[-2]{'maxlen'}[$outer_row][$outer_column] = $max_nested_width;
+	    }
+
+	    pop @Apache::londefdef::table;
+	    push @{$Apache::londefdef::table[-1]{'include'}}, $inmemory;
+	} else {
+	    $currentstring .= $Apache::londefdef::table[-1]{'output'};
+	    pop @Apache::londefdef::table;
+	    undef @Apache::londefdef::table;
+	}
+	}
+	&enable_para();
+    }
+    }
+    return $currentstring;
+}
+
+#-- <tr> tag (end tag optional)
+sub start_tr {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+
+	my $align = &Apache::lonxml::get_param('align', $parstack, $safeeval, undef, 1);
+	$Apache::londefdef::table[-1]->start_row();
+	
+	if ($align ne '') {
+	    $Apache::londefdef::table[-1]->configure_row({default_halign => $align});
+	}
+
+	#---------------------------------------------------------------
+	# Old table code.
+	#---------------------------------------------------------------
+
+	if (0) {
+	$Apache::londefdef::table[-1]{'row_number'}++;
+	my $alignchar=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
+	if ($alignchar ne '') {
+	    push @ {$Apache::londefdef::table[-1]{'rows'} },substr($alignchar,0,1);
+	} else {
+	    push @ {$Apache::londefdef::table[-1]{'rows'} }, 'l';
+	}
+	push ( @{ $Apache::londefdef::table[-1]{'rowdata'} }, $Apache::londefdef::table[-1]{'hinc'});
+	#
+	#  Need to save the number of table columns to preserve the max # columns.
+	#
+	$Apache::londefdef::table[-1]{'prior_columns'}   = $Apache::londefdef::table[-1]{'counter_columns'};
+	$Apache::londefdef::table[-1]{'counter_columns'} = -1;
+	push @ {$Apache::londefdef::table[-1]{'TeXlen'}}, [];
+	push @ {$Apache::londefdef::table[-1]{'objectlen'}}, [];
+	push @ {$Apache::londefdef::table[-1]{'minlen'}}, [];
+	push @ {$Apache::londefdef::table[-1]{'maxlen'}}, [];
+	push @ {$Apache::londefdef::table[-1]{'content'}}, [];
+    }
+    } 
+    return $currentstring;
+}
+        
+sub end_tr {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close any pending <p> in the row.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];     
+    } elsif ($target eq 'tex') {
+
+	# In case the user is missing a </td> or </th> tag:
+
+	if ($Apache::londefdef::TD_redirection) {
+	    &end_td_tex($parstack,$parser,$safeeval);    
+	}
+	$Apache::londefdef::table[-1]->end_row();
+
+	#-----------------------------------------------
+	# Old table code
+	#-----------------------------------------------
+
+	if (0) {
+	if ($Apache::londefdef::TD_redirection) {
+	    &end_td_tex($parstack,$parser,$safeeval);    
+	}
+	# Counter columns must be the maximum number of columns seen
+	# in the table so far so:
+	if ($Apache::londefdef::table[-1]{'prior_columns'} > $Apache::londefdef::table[-1]{'counter_columns'}) {
+	    $Apache::londefdef::table[-1]{'counter_columns'} = $Apache::londefdef::table[-1]{'prior_columns'};
+	}
+    }
+
+	
+    }
+    return $currentstring;
+}
+
+#-- <td> tag (end tag optional)
+sub start_td {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$Apache::londefdef::TD_redirection = 1;
+	&tag_check('tr','td',$tagstack,$parstack,$parser,$safeeval);
+    } 
+    return $currentstring;
+}   
+    
+sub tag_check {
+    my ($good_tag,$bad_tag,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my @ar=@$parstack; 
+    for (my $i=$#ar-1;$i>=0;$i--) {
+	if (lc($$tagstack[$i]) eq $good_tag) {
+	    &start_td_tex($parstack,$parser,$safeeval);
+	    last;
+	} elsif (lc($$tagstack[$i]) eq $bad_tag) {
+	    splice @ar, $i+1;
+	    &end_td_tex(\@ar,$parser,$safeeval);
+	    &start_td_tex($parstack,$parser,$safeeval);
+	    last;
+	}
+    }
+    return '';
+}
+
+#
+#  Factor out cell configuration hash generation:
+#
+
+sub cell_config_hash {
+    my ($align, $rowspan, $colspan) = @_;
+    my %config;
+    if ($align ne '') {
+	$config{'halign'} = $align;
+    }
+    if ($colspan ne "") {
+	$config{'colspan'} = $colspan;
+    }
+    if ($rowspan ne '') {
+	$config{'rowspan'} = $rowspan;
+    }
+    return \%config;
+}
+ 
+sub start_td_tex {
+    my ($parstack,$parser,$safeeval) = @_;
+
+    # At this stage, an empty cell is created with the
+    # appropriate rowspan/colspan and alignment
+    # attributes, but empty of text.  end_td_tex will
+    # fetch the contents from the recursive parse and
+    # fill the cell with them:
+    my $align   = &Apache::lonxml::get_param('align', $parstack, $safeeval, undef, 1);
+    my $rowspan = &Apache::lonxml::get_param('rowspan', $parstack, $safeeval, undef, 1);
+    my $colspan = &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 1);
+
+    my $config = &cell_config_hash($align, $rowspan, $colspan);
+
+    my $table = $Apache::londefdef::table[-1];
+    $table->add_cell('', $config);
+    
+
+    #------------------------------------------------
+    #  Old table code.
+    #------------------------------------------------
+
+    if (0) {
+
+    my $alignchar = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
+    if ($alignchar eq '') {
+	$alignchar = $Apache::londefdef::table[-1]{'rows'}[-1];
+    }
+    push @{ $Apache::londefdef::table[-1]{'align'}[$Apache::londefdef::table[-1]{'row_number'}] }, $alignchar;
+    $Apache::londefdef::table[-1]{'counter_columns'}++;
+    my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+    if (defined $TeXwidth) {		
+	my $current_length=&recalc($TeXwidth);
+	$current_length=~/(\d+\.?\d*)/;
+	push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$1;
+    }
+    }
+    &Apache::lonxml::startredirection();
+    return '';
+}
+
+sub end_td_tex {
+
+    my $text = &Apache::lonxml::endredirection();
+    my $table = $Apache::londefdef::table[-1];
+    $table->append_cell_text($text);
+
+    #-------------------------------------------------
+    # Old table code
+    #-------------------------------------------------
+
+    if (0) {
+    my ($parstack,$parser,$safeeval) = @_;
+    my $current_row    = $Apache::londefdef::table[-1]{'row_number'};
+    my $current_column = $Apache::londefdef::table[-1]{'counter_columns'}; 
+    my $data = &Apache::lonxml::endredirection();
+
+    #  The rowspan array of the table indicates which cells are part of a span.
+    #  n indicates the start of a span set of n rows.
+    #  ^ indicates a cell that continues a span set.
+    #  _ indicates the cell is at the bottom of a span set.
+    #  If this and subsequent cells are part of a rowspan, we must
+    #  push along the row until we find one that is not.
+
+    while ((defined $Apache::londefdef::table[-1]{'rowspan'}[$current_row] [$current_column]) 
+	   && ($Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column] =~ /[\^\_]/)) {
+	# Part of a span.
+	push @ {$Apache::londefdef::table[-1]{'content'}[-1]}, '';
+	$current_column++;
+    }
+    $Apache::londefdef::table[-1]{'counter_columns'} = $current_column;
+   
+
+    # Get the column and row spans.
+    # Colspan can be done via \multicolumn if I can figure out the data structs.
+
+    my $colspan = &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 0);
+    if (!$colspan) {
+	$colspan = 1;
+    }
+
+    my $rowspan = &Apache::lonxml::get_param('rowspan', $parstack, $safeeval, undef, 0);
+    if (!$rowspan) {
+	$rowspan = 1;
+    }
+
+
+
+    for (my $c = 0; $c < $colspan; $c++) {
+	$Apache::londefdef::table[-1]{'rowspan'}[$current_row][$current_column+$c] = $rowspan;
+	for (my $i = 1; $i < $rowspan; $i++) {
+	    $Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '^';
+	    if ($i == ($rowspan-1)) {
+		$Apache::londefdef::table[-1]{'rowspan'}[$current_row+$i][$current_column+$c] = '_';
+	    }
+	}
+    }
+
+    my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+    if (defined $TeXwidth) {		
+	for (my $c = 0; $c < $colspan; $c++) {
+	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	}
+    } else {
+	if (($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) or ($data=~m/\[(\d+\.?\d*)\s*mm\]/)) {
+	    my $garbage_data=$data;
+	    my $fwidth=0;
+            while ($garbage_data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
+		my $current_length=&recalc($1);
+		$current_length=~/(\d+\.?\d*)/;
+		if ($fwidth<$1) {$fwidth=$1;}
+		$garbage_data=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
+	    }
+            while ($garbage_data=~m/\[(\d+\.?\d*)\s*mm\]/) {
+		my $current_length=$1;
+		if ($fwidth<$current_length) {$fwidth=$current_length;}
+		$garbage_data=~s/\[(\d+\.?\d*)\s*mm\]//;
+	    }
+	    for (my $c = 0; $c < $colspan; $c++) {
+		push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
+		push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    }
+	} elsif ($data=~/\\parbox\{\s*\d+\.?\d*\s*(mm|cm|in|pc|pt)*\s*\}/ or $data=~/\\epsfxsize\s*=\s*\d+\.?\d*\s*(mm|cm|in|pc|pt)*/) {
+	    my $garbage_data=$data;
+	    my $fwidth=0;
+            while ($garbage_data=~/\\parbox\{\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)\s*\}/) {
+		my $current_length=&recalc($1);
+		$current_length=~/(\d+\.?\d*)/;
+		if ($fwidth<$1) {$fwidth=$1;}
+		$garbage_data=~s/\\parbox\{\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
+	    }
+            while ($garbage_data=~/\\epsfxsize\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
+		my $current_length=&recalc($1);
+		$current_length=~/(\d+\.?\d*)/;
+		if ($fwidth<$1) {$fwidth=$1;}
+		$garbage_data=~s/\\epsfxsize\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
+	    }
+	    for (my $c = 0; $c < $colspan; $c++) {
+		push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
+		push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    }
+	    $data=~s/\\\\\s*$//; 
+	} else {  
+	    $data=~s/^\s+(\S.*)/$1/; 
+	    $data=~s/(.*\S)\s+$/$1/;
+	    $data=~s/(\s)+/$1/;
+	    my ($current_length,$min_length)=(0,0);
+	    if ($data=~/\\vskip/) {
+                my $newdata=$data;
+		$newdata=~s/\\vskip \d*\.?\d*\s*mm/THISISJUSTTEMPORARYSEPARATOR/g;
+		my @newdata=split(/THISISJUSTTEMPORARYSEPARATOR/,$newdata);
+		foreach my $elementdata (@newdata) {
+		    my $lengthnewdata=2.5*&LATEX_length($elementdata);
+		    if ($lengthnewdata>$current_length) {$current_length=$lengthnewdata;}
+                    my @words=split(/ /,$elementdata);
+		    foreach my $word (@words) {
+			my $lengthword=2.5*&LATEX_length($word);
+			if ($min_length<$lengthword) {$min_length=$lengthword;}
+		    }
+		}
+	    } else {
+		$current_length=2.5*&LATEX_length($data);
+                    my @words=split(/ /,$data);
+		    foreach my $word (@words) {
+			my $lengthword=2*&LATEX_length($word);
+			if ($min_length<$lengthword) {$min_length=$lengthword;}
+		    }
+	    }
+	    for (my $c = 0; $c < $colspan; $c++) {
+		push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+		push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$current_length;
+		push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$min_length;
+	    }
+	}        
+    }
+    # Substitute all of the tables nested in this cell in their appropriate places.
+
+
+    my $nested_count = $#{$Apache::londefdef::table[-1]{'include'}}; # This one is constant...
+    for (my $in=0; $in<=$nested_count; $in++) {    
+	my $nested = shift @{$Apache::londefdef::table[-1]{'include'}};
+	$nested =~ s/\\end\{tabular\}\\strut\\\\/\\end\{tabular\}/;
+	# $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
+	$data =~ s/\\keephidden\{NEW TABLE ENTRY\}/$nested/;
+
+    }
+    # Should be be killing off the 'include' elements as they're used up?
+
+    push @ {$Apache::londefdef::table[-1]{'content'}[-1] },$data;
+
+
+
+
+    #  the colspan array will indicate how many columns will be spanned by this
+    #  cell..this requires that counter_columns also be adjusted accordingly
+    #  so that the next bunch of text goes in the right cell.  Note that since
+    #  counter_columns is incremented in the start_td_tex, we adjust by colspan-1.
+    #
+
+    $Apache::londefdef::table[-1]{'counter_columns'} += $colspan -1;
+    for (my $i = 0; $i < ($colspan -1); $i++) {
+	push @ {$Apache::londefdef::table[-1]{'content'}[-1] },'';
+    }
+    for (my $r = 0; $r < $rowspan; $r++) {
+	$Apache::londefdef::table[-1]{'colspan'}[$current_row+$r][$current_column] = $colspan;
+	# Put empty text in spanned cols.
+	
+    }
+
+    }
+
+    return '';
+}
+
+sub end_td {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+        $Apache::londefdef::TD_redirection =0;
+	&end_td_tex($parstack,$parser,$safeeval);
+    }
+    return $currentstring;
+}
+
+#-- <th> tag (end tag optional)
+sub start_th {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$Apache::londefdef::TD_redirection = 1;
+	&tagg_check('tr','th',$tagstack,$parstack,$parser,$safeeval);
+    } 
+    return $currentstring;
+}   
+    
+sub tagg_check {
+    my ($good_tag,$bad_tag,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my @ar=@$parstack; 
+    for (my $i=$#ar-1;$i>=0;$i--) {
+	if (lc($$tagstack[$i]) eq $good_tag) {
+	    &start_th_tex($parstack,$parser,$safeeval);
+	    last;
+	} elsif (lc($$tagstack[$i]) eq $bad_tag) {
+	    splice @ar, $i+1;
+	    &end_th_tex(\@ar,$parser,$safeeval);
+	    &start_th_tex($parstack,$parser,$safeeval);
+	    last;
+	}
+    }
+    return '';
+}
+ 
+sub start_th_tex {
+    my ($parstack,$parser,$safeeval) = @_;
+
+    my $alignment = &Apache::lonxml::get_param('align', $parstack, $safeeval, undef,1);
+    my $rowspan  =  &Apache::lonxml::get_param('rowspan', $parstack, $safeeval, undef, 1);
+    my $colspan  =  &Apache::lonxml::get_param('colspan', $parstack, $safeeval, undef, 1);
+
+    my $config   = cell_config_hash($alignment, $rowspan, $colspan);
+    my $table    = $Apache::londefdef::table[-1];
+    $table->add_cell('\textbf{', $config);
+
+    #-------------------------------------------------------------------------------------
+    #
+    #  Old table code.
+    #
+    #--------------------------------------------------------------------------------------
+
+    if (0) {
+
+
+    my $alignchar = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
+    if ($alignchar eq '') {
+	$alignchar = $Apache::londefdef::table[-1]{'rows'}[-1];
+    }
+    push @{ $Apache::londefdef::table[-1]{'align'}[$Apache::londefdef::table[-1]{'row_number'}] }, $alignchar;
+    $Apache::londefdef::table[-1]{'counter_columns'}++;
+    my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+    if (defined $TeXwidth) {		
+	my $current_length=&recalc($TeXwidth);
+	$current_length=~/(\d+\.?\d*)/;
+	push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$1;
+    }
+    }
+
+    # Accept xml until the </th> tag.
+
+    &Apache::lonxml::startredirection();
+    return '';
+}
+
+sub end_th_tex {
+    my ($parstack,$parser,$safeeval) = @_;
+
+    my $table = $Apache::londefdef::table[-1];
+    my $text  = &Apache::lonxml::endredirection();
+    $table->append_cell_text($text.'}');
+
+    #-----------------------------------------------------------------------------
+    #  Old table code:
+    #-----------------------------------------------------------------------------
+
+    if (0) {
+    my $current_row = $Apache::londefdef::table[-1]{'row_number'};
+    my $data=&Apache::lonxml::endredirection();
+    my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
+    if (defined $TeXwidth) {		
+	push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+    } else {
+	if (($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) or ($data=~m/\[(\d+\.?\d*)\s*mm\]/)) {
+	    my $garbage_data=$data;
+	    my $fwidth=0;
+            while ($garbage_data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
+		my $current_length=&recalc($1);
+		$current_length=~/(\d+\.?\d*)/;
+		if ($fwidth<$1) {$fwidth=$1;}
+		$garbage_data=~s/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)//;
+	    }
+            while ($garbage_data=~m/\[(\d+\.?\d*)\s*mm\]/) {
+		my $current_length=$1;
+		if ($fwidth<$current_length) {$fwidth=$current_length;}
+		$garbage_data=~s/\[(\d+\.?\d*)\s*mm\]//;
+	    }
+	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$fwidth;
+	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	} else {  
+	    $data=~s/^\s+(\S.*)/$1/; 
+	    $data=~s/(.*\S)\s+$/$1/;
+	    $data=~s/(\s)+/$1/;
+	    my ($current_length,$min_length)=(0,0);
+	    if ($data=~/\\vskip/) {
+                my $newdata=$data;
+		$newdata=~s/\\vskip \d*\.?\d*\s*mm/THISISJUSTTEMPORARYSEPARATOR/g;
+		my @newdata=split(/THISISJUSTTEMPORARYSEPARATOR/,$newdata);
+		foreach my $elementdata (@newdata) {
+		    my $lengthnewdata=2.5*&LATEX_length($elementdata);
+		    if ($lengthnewdata>$current_length) {$current_length=$lengthnewdata;}
+                    my @words=split(/ /,$elementdata);
+		    foreach my $word (@words) {
+			my $lengthword=2.5*&LATEX_length($word);
+			if ($min_length<$lengthword) {$min_length=$lengthword;}
+		    }
+		}
+	    } else {
+		$current_length=2.5*&LATEX_length($data);
+                    my @words=split(/ /,$data);
+		    foreach my $word (@words) {
+			my $lengthword=2*&LATEX_length($word);
+			if ($min_length<$lengthword) {$min_length=$lengthword;}
+		    }
+	    }
+	    push @ {$Apache::londefdef::table[-1]{'TeXlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'objectlen'}[$Apache::londefdef::table[-1]{'row_number'}] },'0';
+	    push @ {$Apache::londefdef::table[-1]{'maxlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$current_length;
+	    push @ {$Apache::londefdef::table[-1]{'minlen'}[$Apache::londefdef::table[-1]{'row_number'}] },$min_length;
+	}        
+    }
+	for (my $in=0; $in<=$#{$Apache::londefdef::table[-1]{'include'}};$in++) {         
+	    $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
+	}
+    #make data bold
+    $data='\textbf{'.$data.'}';
+    push @ {$Apache::londefdef::table[-1]{'content'}[-1] },$data;
+    }
+    return'';
+}
+
+sub end_th {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# Close any open <p> in the row.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];     
+    } elsif ($target eq 'tex') {
+        $Apache::londefdef::TD_redirection =0;
+	&end_th_tex($parstack,$parser,$safeeval);
+    }
+    return $currentstring;
+}
+     
+#-- <img> tag (end tag forbidden)
+#
+#  Render the <IMG> tag.
+#     <IMG> has the following attributes (in addition to the 
+#     standard HTML ones:
+#      TeXwrap   - Governs how the tex target will try to wrap text around
+#                  horizontally aligned images.
+#      TeXwidth  - The width of the image when rendered for print (mm).
+#      TeXheight - The height of the image when rendered for print (mm)
+#         (Note there seems to also be support for this as a % of page size)
+#      
+sub start_img {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
+    my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,
+					 undef,1);
+    if (! $src && 
+	($target eq 'web' || $target eq 'webgrade' || $target eq 'tex')
+	) { 
+	my $inside = &Apache::lonxml::get_all_text("/img",$parser,$style);
+	return '';
+    }
+    &Apache::lonxml::extlink($src);
+    my $currentstring = '';
+    my $scaling = .3;
+
+   # Render unto browsers that which are the browser's...
+
+    if ($target eq 'web' || $target eq 'webgrade') {
+	if ($env{'browser.imagesuppress'} ne 'on') {
+	    my $enc = ('yes' eq 
+		       lc(&Apache::lonxml::get_param('encrypturl',$parstack,
+						     $safeeval)));
+	    $currentstring.=&Apache::lonenc::encrypt_ref($token,{'src'=>$src},
+							 $enc);
+	} else {
+	    my $alttag = &Apache::lonxml::get_param('alt',$parstack,$safeeval,
+						    undef,1);
+	    if (!$alttag) {
+		$alttag = &Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
+						   $src);
+	    }
+	    $currentstring.='[IMAGE: '.$alttag.']';
+	}
+
+	# and render unto TeX that which is LaTeX
+
+    } elsif ($target eq 'tex') {
+	#
+	#  The alignment will require some superstructure to be put around
+	#  the \includegraphics stuff.  At present we can only partially
+	#  simulate the alignments offered by html.
+	#
+	#
+	my $align = lc(&Apache::lonxml::get_param('align', 
+						  $parstack,
+						  $safeeval,
+						  undef,1));
+	if(!$align) {
+		$align = "bottom";	# This is html's default so it's ours too.
+	}
+	#
+	&Apache::lonxml::debug("Alignemnt = $align");
+	#  LaTeX's image/text wrapping is really bad since it wants to
+	#  make figures float.  
+        #   The user has the optional parameter (applicable only to l/r
+	# alignment to use the picins/parpic directive to get wrapped text
+	# this is also imperfect.. that's why we give them a choice...
+	# so they can't yell at us for our choice.
+	#
+	my $latex_rendering = &Apache::lonxml::get_param('TeXwrap',
+							    $parstack,
+							    $safeeval,
+							    undef,0);
+	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering");
+	if(!$latex_rendering) {
+		$latex_rendering = "texwrap";
+	}
+	# using texwrap inside a table does not work. So, if after all of this,
+	# texwrap is on, we turn it off if we detect we're in a table:
+	#
+	if (($latex_rendering eq 'texwrap') && &is_inside_of($tagstack, "table")) {
+	    $latex_rendering = 'parpic';
+	}
+
+	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering image file: $src");
+
+	#if original bmp/gif/jpg/png file exist do following:
+	my $origsrc=$src;
+	my ($path,$file) = &get_eps_image($src);
+	# &Apache::lonnet::logthis("Image source: $src result: $path $file");
+	$src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
+	&Apache::lonxml::debug("path = $path file = $file src = $src");
+	if (-e $src) {
+	    &Apache::lonxml::debug("$src exists");
+	    my ($height_param,$width_param)=
+		&image_size($origsrc,0.3,$parstack,$safeeval);
+	    my $size;
+	    if ($width_param)  { $size.='width='.$width_param.' mm,'; }
+	    if ($height_param) { $size.='height='.$height_param.' mm]'; }
+	    # Default size if not able to extract that (e.g. eps image).
+	    
+	    # &Apache::lonnet::logthis("Size = $size");
+	    
+	    $size='['.$size;
+	    $size=~s/,$/]/; 
+	    $currentstring .= '\graphicspath{{'.$path.'}}'
+		.'\includegraphics'.$size.'{'.$file.'} ';
+	    my $closure;
+	    ($currentstring, $closure) = &align_latex_image($align, 
+							    $latex_rendering, 
+							    $currentstring, 
+							    $width_param, 
+							    $height_param);
+	    $currentstring .= $closure;
+						
+	} else {
+	    &Apache::lonxml::debug("$src does not exist");
+	    #original image file doesn't exist so check the alt attribute
+	    my $alt = 
+		&Apache::lonxml::get_param('alt',$parstack,$safeeval,undef,1);
+	    unless ($alt) {
+		$alt=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
+	    }
+
+	    if ($alt) { $currentstring .= ' '.$alt.' '; }
+	}
+
+	# And here's where the semi-quote breaks down: allow the user
+        # to edit the beast as well by rendering the problem for edit:
+    } elsif ($target eq 'edit') {
+        my $only = join(',',&Apache::loncommon::filecategorytypes('Pictures'));
+	$currentstring .=&Apache::edit::tag_start($target,$token);
+	$currentstring .=&Apache::edit::text_arg('Image Url:','src',$token,70).
+	    &Apache::edit::browse('src',undef,'alt',$only).' '.
+	    &Apache::edit::search('src',undef,'alt').'<br />';
+	$currentstring .=&Apache::edit::text_arg('Description:','alt',$token,70).'<br />';
+	$currentstring .=&Apache::edit::text_arg('width (pixel):','width',$token,5);
+	$currentstring .=&Apache::edit::text_arg('height (pixel):','height',$token,5).'<br />';
+	$currentstring .=&Apache::edit::text_arg('TeXwidth (mm):','TeXwidth',$token,5);
+	$currentstring .=&Apache::edit::text_arg('TeXheight (mm):','TeXheight',$token,5);
+	$currentstring .=&Apache::edit::select_arg('Alignment:','align',
+						   ['','bottom','middle','top','left','right'],$token,5);
+	$currentstring .=&Apache::edit::select_arg('TeXwrap:', 'TeXwrap',
+						   ['', 'none','parbox', 'parpic', 'wrapfigure'], $token, 2);
+        my $alt=    &Apache::lonxml::get_param('alt',$parstack,$safeeval);
+        my $enc=    &Apache::lonxml::get_param('encrypturl',$parstack,$safeeval);
+
+	$currentstring .=&Apache::edit::select_arg('Encrypt URL:','encrypturl',
+						   ['no','yes'], $token, 2);
+        if (($alt=~/\S/) && (lc($enc) eq 'yes')) {
+           $currentstring.='<br /><span class="LC_warning">'.&mt('Warning: the description "[_1]" will be available, even for encrypted URL',$alt).'</span><br />';
+        }
+	$currentstring .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
+	my $src=    &Apache::lonxml::get_param('src',$parstack,$safeeval);
+	my $width=  &Apache::lonxml::get_param('width',$parstack,$safeeval);
+	my $height= &Apache::lonxml::get_param('height',$parstack,$safeeval);
+
+        if ($token->[2]{'src'}=~/\$/) {
+           $currentstring.=&mt('Variable image source');
+        } elsif ($token->[2]{'src'}=~/\S/) {
+	   $currentstring .= '<img src="'.$src.'" alt="'.$alt.'" ';
+	   if ($width) { $currentstring.=' width="'.$width.'" '; }
+	   if ($height) { $currentstring.=' height="'.$height.'" '; }
+	   $currentstring .= ' />';
+        } else {
+           $currentstring.=&mt("No image source specified");
+        }
+    } elsif ($target eq 'modified') {
+	my ($osrc,$owidth,$oheight)=
+	    ($token->[2]{'src'},$token->[2]{'width'},$token->[2]{'height'});
+	my $ctag=&Apache::edit::get_new_args($token,$parstack,
+					     $safeeval,'src','alt','align',
+					     'TeXwidth','TeXheight', 'TeXwrap',
+					     'width','height','encrypturl');
+	my ($nsrc,$nwidth,$nheight)=
+	    ($token->[2]{'src'},$token->[2]{'width'},$token->[2]{'height'});
+	my $loc=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$nsrc);
+	&image_replication($loc);
+	my ($iwidth,$iheight);
+	if (-e $loc) {
+	    my $image = Image::Magick->new;
+	    $image->Read($loc);
+	    ($iwidth, $iheight) = ($image->Get('width'),
+				   $image->Get('height'));
+	}
+	if ($osrc ne $nsrc || (!$nwidth && !$nheight)) {
+	    # changed image or no size specified,
+            # if they didn't explicitly change the 
+            # width or height use the ones from the image
+	    if ($iwidth && $iheight) {
+		if ($owidth == $nwidth || (!$nwidth && !$nheight)) {
+		    $token->[2]{'width'} = $iwidth;$ctag=1;
+		}
+		if ($oheight == $nheight || (!$nwidth && !$nheight)) {
+		    $token->[2]{'height'}=$iheight;$ctag=1;
+		}
+	    }
+	}
+	my ($cwidth,$cheight)=($token->[2]{'width'},$token->[2]{'height'});
+	# if we don't have a width or height
+	if ($iwidth && $cwidth && !$cheight) {
+	    $token->[2]{'height'}=int(($cwidth/$iwidth)*$iheight);$ctag=1;
+	}
+	if ($iheight && $cheight && !$cwidth) {
+	    $token->[2]{'width'}=int(($cheight/$iheight)*$iwidth);$ctag=1;
+	}
+	if ($ctag) {$currentstring=&Apache::edit::rebuild_tag($token);}
+    }
+
+    return $currentstring;
+}
+
+sub end_img {
     my ($target,$token) = @_;
     my $currentstring = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'webgrade') {
 	$currentstring = $token->[2];
     } elsif ($target eq 'tex') {
-	$currentstring = " \\end{figure}";
+	$currentstring = '';
+    }
+    return $currentstring;
+}
+
+#-- <applet> tag (end tag required)
+sub start_applet {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    
+    my $code=&Apache::lonxml::get_param('code',$parstack,$safeeval,undef,1);
+    &Apache::lonxml::extlink($code);
+    my $archive=&Apache::lonxml::get_param('archive',$parstack,$safeeval,
+					   undef,1);
+    &Apache::lonxml::extlink($archive);
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	if ($env{'browser.appletsuppress'} ne 'on') {
+	    $currentstring = &Apache::lonenc::encrypt_ref($token,
+							  {'code'=>$code,
+							   'archive'=>$archive}
+							  );
+	} else {
+	    my $alttag= &Apache::lonxml::get_param('alt',$parstack,
+						   $safeeval,undef,1);
+	    unless ($alttag) {
+		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
+						 $code);
+	    }
+	    $currentstring='[APPLET: '.$alttag.']';
+	}
+    } elsif ($target eq 'tex') {
+	# Turn off some stuff we can't be inside thank you LaTeX
+	
+
+	my $restart_sub = 0;
+	my $restart_sup = 0;
+
+	# Since <sub> and <sup> are simple tags it's ok to turn off/on
+	# using the start_ stop_ functions.. those tags only care about
+	# $target.
+
+	if (&is_inside_of($tagstack, "sub")) {
+	    $restart_sub = 1;
+	    $currentstring .= &end_sub($target, $token, $tagstack, 
+				       $parstack, $parser, $safeeval);
+	}
+	if (&is_inside_of($tagstack, "sup")) {
+	    $restart_sup = 1;
+	    $currentstring .= &end_sup($target, $token, $tagstack,
+				       $parstack, $parser, $safeeval);
+	}
+
+	# Now process the applet; just replace it with its alt attribute.
+
+	my $alttag= &Apache::lonxml::get_param('alt',$parstack,
+					       $safeeval,undef,1);
+	unless ($alttag) {
+	    my $code=&Apache::lonxml::get_param('code',$parstack,$safeeval,
+						undef,1);
+	    $alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
+					     $code);
+	}
+	$currentstring.='\begin{center} \fbox{Java Applet: '.$alttag.
+	    '.}\end{center}';
+
+	# Turn stuff back on that we can't be inside of.
+
+	if ($restart_sub) {
+	    $currentstring .= &start_sub($target, $token, $tagstack,
+					$parstack, $parser, $safeeval);
+	}
+	if ($restart_sup) {
+	    $currentstring .= &start_sup($target, $token, $tagstack,
+					 $parstack, $parser, $safeeval);
+	}
     } 
     return $currentstring;
 }
 
-#-- <embed> tag
+sub end_applet {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];
+    } elsif ($target eq 'tex') {
+    } 
+    return $currentstring;
+}
 
+#-- <embed> tag (end tag optional/required)
 sub start_embed {    
-    my ($target,$token) = @_;
-    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
-	$token->[2]->{'src'};
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
+    &Apache::lonxml::extlink($src);
     my $currentstring = '';
-    if ($target eq 'web') {
-	$currentstring = $token->[4];
+    if ($target eq 'web' || $target eq 'webgrade') {
+	if ($env{'browser.embedsuppress'} ne 'on') {
+	    $currentstring=&Apache::lonenc::encrypt_ref($token,{'src'=>$src});
+	} else {
+	    my $alttag=&Apache::lonxml::get_param
+		('alt',$parstack,$safeeval,undef,1);
+	    unless ($alttag) {
+		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
+	    }
+	    $currentstring='[EMBED: '.$alttag.']';
+	}
     } elsif ($target eq 'tex') {
-	$currentstring = " \\begin{figure} ";  
     } 
     return $currentstring;
 }
-        sub end_embed {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\end{figure}";  
-	    } 
-	   return $currentstring;
-	}
-
-#-- <param> tag
-
-        sub start_param {
-	    my ($target,$token) = @_;
-	    if ($token->[2]->{'name'} eq 'cabbase') {
-                      $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
-					     $token->[2]->{'value'};
-            }   
-            $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=   
-                                        $token->[2]->{'src'};
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[4];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\begin{figure} ";  
-	    } 
-	   return $currentstring;
-	}
-        sub end_param {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-              $currentstring = $token->[2];     
-	    } elsif ($target eq 'tex') {
-              $currentstring = " \\end{figure}";  
-	    } 
-	   return $currentstring;
+
+sub end_embed {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {  
+    } 
+    return $currentstring;
+}
+
+#-- <param> tag (end tag forbidden)
+sub start_param {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    if (&Apache::lonxml::get_param('name',$parstack,
+				   $safeeval,undef,1)=~/^cabbase$/i) {
+	my $value=&Apache::lonxml::get_param('value',$parstack,
+					     $safeeval,undef,1);
+	&Apache::lonxml::extlink($value);
+    } 
+  
+    my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
+    &Apache::lonxml::extlink($src);
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my %toconvert;
+	my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
+	if ($src) { $toconvert{'src'}= $src; }
+	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval,
+					    undef,1);
+	if ($name=~/^cabbase$/i) {
+	    $toconvert{'value'}=&Apache::lonxml::get_param('value',$parstack,
+							   $safeeval,undef,1);
 	}
+	$currentstring = &Apache::lonenc::encrypt_ref($token,\%toconvert);
+    } elsif ($target eq 'tex') {
+    } 
+    return $currentstring;
+}
+
+sub end_param {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];     
+    } elsif ($target eq 'tex') {
+    } 
+    return $currentstring;
+}
 
 #-- <allow> tag
+sub start_allow {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
+    &Apache::lonxml::extlink($src);
+
+    if ($target eq 'tex') { &image_replication($src); }
+    my $result;
+    if ($target eq 'edit') {
+	$result .=&Apache::edit::tag_start($target,$token);
+	$result .=&Apache::edit::text_arg('File Spec:','src',$token,70);
+	$result .=&Apache::edit::end_row();#.&Apache::edit::start_spanning_row();
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+						     $safeeval,'src');
+	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+    }
+    return $result;
+}
 
-        sub start_allow {
-	    my ($target,$token) = @_;
+sub end_allow {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    if ( $target eq 'edit') { return (&Apache::edit::end_table()); }
+    return '';
+}
 
-            $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=   
-                                        $token->[2]->{'src'};
+#-- Frames (end tag required)
+#-- <frameset>
+sub start_frameset {
+    my ($target,$token) = @_;
+    my $currentstring = '';	# Close any pending para.
+    if ($target eq 'web' || $target eq 'webgrade') { 
+	$currentstring = 
+	    &Apache::loncommon::start_page($Apache::londefdef::title,
+					   $Apache::londefdef::head,
+					   {'add_entries'    => $token->[2],
+					    'no_title'       => 1,
+					    'force_register' => 1,
+					    'frameset'       => 1,});
 
-	   return '';
+    }
+    return $currentstring;
+}
+
+sub end_frameset {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];
+    }
+    return $currentstring;
+}
+
+#-- <xmp> (end tag required)
+sub start_xmp {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\begin{verbatim}';
+    } 
+    return $currentstring;
+}
+
+sub end_xmp {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\end{verbatim}';
+    }
+    return $currentstring;
+}
+
+#-- <pre> (end tag required)
+sub start_pre {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# close off pending <p>
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\begin{verbatim}';
+	&Apache::lonxml::disable_LaTeX_substitutions();
+    } 
+    return $currentstring;
+}
+
+sub end_pre {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring .= '\end{verbatim}';
+	&Apache::lonxml::enable_LaTeX_substitutions();
+    }
+    return $currentstring;
+}
+
+#-- <insert>
+sub start_insert {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
+	$currentstring .= '<b>'.$display.'</b>';;
+    }
+    return $currentstring;
+}
+
+sub end_insert {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= '';
+    }
+    return $currentstring;
+}
+
+#-- <externallink>
+sub start_externallink {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
+	$currentstring .= '<b>'.$display.'</b>';;
+    }
+    return $currentstring;
+}
+
+sub end_externallink {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= '';
+    }
+    return $currentstring;
+}
+
+#-- <blankspace heigth="">
+sub start_blankspace {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = &end_p();	# closes off any unclosed <p>
+    if ($target eq 'tex') {
+	my $howmuch = &Apache::lonxml::get_param('heigth',$parstack,$safeeval,undef,1);
+	$currentstring .= '\vskip '.$howmuch.' ';
+    }
+    return $currentstring;
+}
+
+sub end_blankspace {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'tex') {
+	$currentstring .= '';
+    }
+    return $currentstring;
+}
+
+#-- <abbr> tag (end tag required)
+sub start_abbr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_abbr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <acronym> tag (end tag required)
+sub start_acronym {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_acronym {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <area> tag (end tag forbidden)
+sub start_area {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_area {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <base> tag (end tag forbidden)
+sub start_base {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    }
+    return $currentstring;
+}
+
+sub end_base {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <bdo> tag (end tag required)
+sub start_bdo {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_bdo {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <bgsound> tag (end tag optional)
+sub start_bgsound {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_bgsound {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <blink> tag (end tag required)
+sub start_blink {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_blink {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <blockquote> tag (end tag required)
+sub start_blockquote {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# Close any unclosed <p>
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } 
+    if ($target eq 'tex') {
+	$currentstring .= '\begin{quote}';
+    }
+    return $currentstring;
+}
+
+sub end_blockquote {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    if ($target eq 'tex') {
+	$currentstring = '\end{quote}';
+    }
+    return $currentstring;
+}
+
+#-- <button> tag (end tag required)
+sub start_button {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_button {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <caption> tag (end tag required)
+sub start_caption {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_caption {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <col> tag (end tag forbdden)
+sub start_col {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_col {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <colgroup> tag (end tag optional)
+sub start_colgroup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_colgroup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <del> tag (end tag required)
+sub start_del {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_del {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <fieldset> tag (end tag required)
+sub start_fieldset {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_fieldset {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <frame> tag (end tag forbidden)
+sub start_frame {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_frame {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <iframe> tag (end tag required)
+sub start_iframe {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_iframe {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <ins> tag (end tag required)
+sub start_ins {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_ins {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <isindex> tag (end tag forbidden)
+sub start_isindex {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_isindex {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <keygen> tag (end tag forbidden)
+sub start_keygen {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_keygen {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <label> tag
+sub start_label {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_label {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <layer> tag (end tag required)
+sub start_layer {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_layer {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <legend> tag (end tag required)
+sub start_legend {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_legend {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <link> tag (end tag forbidden)
+sub start_link {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	my $href=&Apache::lonxml::get_param('href',$parstack,$safeeval,
+					    undef,1);
+	&Apache::lonxml::extlink($href);
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_link {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <marquee> tag (end tag optional)
+sub start_marquee {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_marquee {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <multicol> tag (end tag required)
+sub start_multicol {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# Close any pending <p>
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_multicol {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <nobr> tag (end tag required)
+sub start_nobr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    }  elsif ($target eq 'tex') {
+	$currentstring='\mbox{';
+    }
+    return $currentstring;
+}
+
+sub end_nobr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    }   elsif ($target eq 'tex') {
+	$currentstring='}';
+    }
+    return $currentstring;
+}
+
+#-- <noembed> tag (end tag required)
+sub start_noembed {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_noembed {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <noframes> tag (end tag required)
+sub start_noframes {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_noframes {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <nolayer> tag (end tag required)
+sub start_nolayer {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_nolayer {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <noscript> tag (end tag required)
+sub start_noscript {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_noscript {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <object> tag (end tag required)
+sub start_object {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_object {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <optgroup> tag (end tag required)
+sub start_optgroup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_optgroup {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <samp> tag (end tag required)
+sub start_samp {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$currentstring='\texttt{';
+    }
+    return $currentstring;
+}
+
+sub end_samp {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } elsif ($target eq 'tex') {
+	$currentstring='}';
+    }
+    return $currentstring;
+}
+
+#-- <server> tag
+sub start_server {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_server {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <spacer> tag (end tag forbidden)
+sub start_spacer {
+    my ($target,$token) = @_;
+    my $currentstring = &end_p();	# Close off any open <p> tag.
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring .= $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_spacer {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <span> tag (end tag required)
+sub start_span {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_span {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <tbody> tag (end tag optional)
+sub start_tbody {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_tbody {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <tfoot> tag (end tag optional)
+sub start_tfoot {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_tfoot {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <thead> tag (end tag optional)
+sub start_thead {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_thead {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <var> tag
+sub start_var {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } elsif ($target eq 'tex') {
+	$currentstring = '\textit{'; 
+    }
+    return $currentstring;
+}
+
+sub end_var {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];
+    } elsif ($target eq 'tex') {
+	$currentstring = '}'; 
+    } 
+    return $currentstring;
+}
+
+#-- <wbr> tag (end tag forbidden)
+sub start_wbr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[4];     
+    } 
+    return $currentstring;
+}
+
+sub end_wbr {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = $token->[2];    
+    } 
+    return $currentstring;
+}
+
+#-- <hideweboutput> tag
+sub start_hideweboutput {
+    my ($target,$token) = @_;
+    if ($target eq 'web' || $target eq 'webgrade') {
+	&Apache::lonxml::startredirection();     
+    } 
+    return '';
+}
+
+sub end_hideweboutput {
+    my ($target,$token) = @_;
+    my $currentstring = '';
+    if ($target eq 'web' || $target eq 'webgrade') {
+	$currentstring = &Apache::lonxml::endredirection();    
+    } 
+    return '';
+}
+
+
+sub image_replication {
+    my $src = shift;
+    if (not -e $src) { &Apache::lonnet::repcopy($src); }
+    #replicates eps or ps 
+    my $epssrc = my $pssrc = $src;
+    $epssrc =~ s/\.(gif|jpg|jpeg|png)$/.eps/i;
+    $pssrc  =~ s/\.(gif|jpg|jpeg|png)$/.ps/i;
+    if (not -e $epssrc && not -e $pssrc) {
+	my $result=&Apache::lonnet::repcopy($epssrc);
+	if ($result ne 'ok') { &Apache::lonnet::repcopy($pssrc); }
+    }
+    return '';
+}
+
+
+
+sub resize_image {
+    my ($height_param, $width_param, $scaling,
+	$parstack, $safeeval, $depth, $cis) = @_;
+
+    # First apply the scaling...
+
+    $height_param = $height_param * $scaling;
+    $width_param  = $width_param  * $scaling;
+
+    #do we have any specified LaTeX size of the picture?
+    my $toget='TeXwidth'; 
+    if ($cis) { 
+	$toget=lc($toget); 
+    }
+    my $TeXwidth = &Apache::lonxml::get_param($toget,$parstack,
+					      $safeeval,$depth,$cis);
+    $toget='TeXheight'; if ($cis) { $toget=lc($toget); }
+    my $TeXheight = &Apache::lonxml::get_param($toget,$parstack,
+					       $safeeval,$depth,$cis);
+    #do we have any specified web size of the picture?
+    my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval,
+					   $depth,1);
+    if ($TeXwidth) { 
+	my $old_width_param=$width_param;
+	if ($TeXwidth=~/(\d+)\s*\%/) {
+	    $width_param = $1*$env{'form.textwidth'}/100;
+	} else { 
+	    $width_param = $TeXwidth;
+	}
+	if ($TeXheight) {
+	    $height_param = $TeXheight;
+	} elsif ($old_width_param) {
+	    $height_param=$TeXwidth/$old_width_param*$height_param;
+	}
+    } elsif ($TeXheight) {
+	$height_param = $TeXheight;
+	if ($height_param) {
+	    $width_param  = $TeXheight/$height_param*$width_param;
+	}
+    } elsif ($width) {
+	my $old_width_param=$width_param;
+	$width_param = $width*$scaling;
+	if ($old_width_param) {
+	    $height_param=$width_param/$old_width_param*$height_param;
 	}
-        sub end_allow {
-	   return '';
-	}
-#-- Frames
-	sub start_frameset {
-	  my ($target,$token) = @_;
-	  my $currentstring = '';
-	  if ($target eq 'web') { 
-	    if (!$Apache::lonxml::registered) {
-	      $currentstring.='<head>'.
-		  &Apache::lonxml::registerurl(undef,$target).'</head>';
-	    }
-	    $currentstring .= $token->[4];
-	  }
-	  return $currentstring;
-	}
-        sub end_frameset {
-	  my ($target,$token) = @_;
-	  my $currentstring = '';
-	  if ($target eq 'web') {
-	    $currentstring = $token->[2];
-	  }
-	  return $currentstring;
-	}
-#-- <pre>
-	sub start_pre {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[4];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\begin{verbatim}';
-	    } 
-           return $currentstring;
-	}
-        sub end_pre {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= $token->[2];
-	    } elsif ($target eq 'tex') {
-		$currentstring .= '\end{verbatim}';
-	    }
-           return $currentstring;
+    }
+    if ($width_param > $env{'form.textwidth'}) {
+        my $old_width_param=$width_param;
+	$width_param =0.95*$env{'form.textwidth'};
+	if ($old_width_param) {
+	    $height_param=$width_param/$old_width_param*$height_param;
 	}
-#-- <insert>
-	sub start_insert {
-	    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-		my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval);
-	       $currentstring .= '<b>'.$display.'</b>';;
-	    }
-           return $currentstring;
-	}
-        sub end_insert {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= '';
+    }
+
+    return ($height_param, $width_param);
+}
+
+sub image_size {
+    my ($src,$scaling,$parstack,$safeeval,$depth,$cis)=@_;
+
+    #size of image from gif/jpg/jpeg/png 
+    my $ressrc=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
+    if (-e $ressrc) {
+	$src = $ressrc;
+    }
+    my $image = Image::Magick->new;
+    my $current_figure = $image->Read($src);
+    my $width_param = $image->Get('width');
+    my $height_param = $image->Get('height');
+    &Apache::lonxml::debug("Image magick says: $src :  Height = $height_param width = $width_param");
+    undef($image);
+
+    ($height_param, $width_param) = &resize_image($height_param, $width_param,
+						  $scaling, $parstack, $safeeval, 
+						  $depth, $cis);
+
+    return ($height_param, $width_param);
+}
+
+sub image_width {
+    my ($height, $width) = &image_size(@_);
+    return $width;
+}
+#  Not yet 100% sure this is correct in all circumstances..
+#  due to my uncertainty about mods to image_size.
+#
+sub image_height {
+    my ($height, $width) = &image_size(@_);
+    return $height;
+}
+
+sub get_eps_image {
+    my ($src)=@_;
+    my $orig_src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1], $src);
+
+    # In order to prevent the substitution of the alt text, we need to
+    # be sure the orig_src file is on system now so:
+
+    if (! -e $orig_src) {
+	&Apache::lonnet::repcopy($orig_src); # Failure is not completely fatal.
+    }
+    &Apache::lonxml::debug("get_eps_image: Original image: $orig_src");
+    my ($spath, $sname, $sext) = &fileparse($src, qr/\.(bmp|gif|png|jpg|jpeg)/i);
+    $src=~s/\.(bmp|gif|png|jpg|jpeg)$/\.eps/i;
+    $src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
+    &Apache::lonxml::debug("Filelocation gives: $src");
+    if (! -e $src) {
+	&Apache::lonxml::debug("$src does not exist");
+	if (&Apache::lonnet::repcopy($src) ne 'ok' ) {
+	    &Apache::lonxml::debug("Repcopy of $src failed (1)");
+	    #if replication failed try to find ps file
+	    $src=~s/\.eps$/\.ps/;
+	    &Apache::lonxml::debug("Now looking for $src");
+	    #if no ps file try to replicate it.
+	    my $didrepcopy = &Apache::lonnet::repcopy($src);
+	    &Apache::lonxml::debug("repcopy of $src ... $didrepcopy");
+	    if ( (not -e $src) ||
+		($didrepcopy ne 'ok')) {
+		&Apache::lonxml::debug("Failed to find or replicate $src");
+
+		#if replication failed try to produce eps file dynamically
+		$src=~s/\.ps$/\.eps/;
+		my $temp_file;
+		open(FILE,">>/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.dat");
+		my $newsrc=$orig_src;
+		$newsrc =~ s|(.*)/res/|/home/httpd/html/res/|;
+		&Apache::lonxml::debug("queueing $newsrc for dynamic eps production.");
+		print FILE ("$newsrc\n");
+		close(FILE);
+		$src=~s|/home/httpd/html/res|/home/httpd/prtspool|;
+		$src=~s|/home/([^/]*)/public_html/|/home/httpd/prtspool/$1/|;
+		if ($sext ne "") {	 # Put the ext. back in to uniquify.
+		    $src =~ s/\.eps$/$sext.eps/;
+		}
+
 	    }
-           return $currentstring;
+
 	}
-#-- <externallink>
-	sub start_externallink {
-	    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-		my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval);
-	       $currentstring .= '<b>'.$display.'</b>';;
-	    }
-           return $currentstring;
-	}
-        sub end_externallink {
-	    my ($target,$token) = @_;
-            my $currentstring = '';
-            if ($target eq 'web') {
-	       $currentstring .= '';
-	    }
-           return $currentstring;
+    } else {
+	# If the postscript file has spaces in its name,
+	# LaTeX will gratuitiously vomit.  Therefore
+	# queue such files for copy with " " replaced by "_".
+	# printout.pm will know them by their .ps  or .eps extensions.
+	my $newsrc = $orig_src;
+	$newsrc    =~  s|(.*)/res/|/home/httpd/html/res/|;
+	open(FILE,">>/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.dat");
+	print FILE "$src\n";
+	close FILE;
+	$src=~s|/home/httpd/html/res|/home/httpd/prtspool|;
+	$src=~s|/home/([^/]*)/public_html/|/home/httpd/prtspool/$1/|;
+    }
+    my ($path,$file)=($src=~m|(.*)/([^/]*)$|);
+    $path =~ s/ /\_/g;
+    $file =~ s/ /\_/g;
+    &Apache::lonxml::debug("get_eps_image returning: $path / $file<BR />");
+    return ($path.'/',$file);
+}
+
+sub eps_generation {
+    my ($src,$file,$width_param) = @_;	     
+    my $filename = "/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.dat";
+    my $temp_file = Apache::File->new('>>'.$filename); 
+    print $temp_file "$src\n";
+    my $newsrc = $src;
+    $newsrc =~ s/(\.bmp|\.gif|\.jpg|\.jpeg)$/\.eps/i;
+    $newsrc=~s{/home/httpd/html/res}{};
+    $newsrc=~s{/home/($LONCAPA::username_re)/public_html/}{/$1/};
+    $newsrc=~s{/\./}{/};
+    $newsrc=~s{/([^/]+)\.(ps|eps)}{/};
+    if ($newsrc=~m{/home/httpd/lonUsers/}) {
+	$newsrc=~s{/home/httpd/lonUsers}{};
+	$newsrc=~s{/($LONCAPA::domain_re)/./././}{/$1/};
+    }
+    if ($newsrc=~m{/userfiles/}) {
+	return ' \graphicspath{{'.$newsrc.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
+    } else {
+	return ' \graphicspath{{/home/httpd/prtspool'.$newsrc.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
+    }
+}
+
+sub file_path {     
+    my $src=shift;
+    my ($file,$path); 
+    if ($src =~ m!(.*)/([^/]*)$!) {
+	$file = $2; 
+	$path = $1.'/'; 
+    } 
+    return $file,$path;
+}
+
+
+sub recalc {
+    my $argument = shift;
+    if (not $argument=~/(mm|cm|in|pc|pt)/) {return $argument.' mm';}
+    $argument=~/\s*(\d+\.?\d*)\s*(mm|cm|in|pc|pt)/;
+    my $value=$1;
+    my $units=$2;
+    if ($units eq 'cm') {
+	$value*=10;
+    } elsif ($units eq 'in') {
+	$value*=25.4;
+    } elsif ($units eq 'pc') {
+	$value*=(25.4*12/72.27);
+    } elsif ($units eq 'pt') {
+	$value*=(25.4/72.27);
+    }
+    return $value.' mm';
+}
+
+sub LATEX_length {
+    my $garbage=shift;
+    $garbage=~s/^\s+$//;
+    $garbage=~s/^\s+(\S.*)/$1/;#space before 
+    $garbage=~s/(.*\S)\s+$/$1/;#space after 
+    $garbage=~s/(\s)+/$1/;#only one space
+    $garbage=~s/(\\begin{([^\}]+)}|\\end{([^\}]+)})//g;#remove LaTeX \begin{...} and \end{...}
+    $garbage=~s/(\$\_\{|\$\_|\$\^{|\$\^|\}\$)//g;#remove $_{,$_,$^{,$^,}$
+    $garbage=~s/([^\\])\$/$1/g;#$
+    $garbage=~s/(\\ensuremath\{\_\{|\\ensuremath\{\_|\\ensuremath\{\^{|\\ensuremath\{\^|\})//g;#remove \ensuremath{...}
+   $garbage=~s/(\\alpha|\\beta|\\gamma|\\delta|\\epsilon|\\verepsilon|\\zeta|\\eta|\\theta|\\vartheta|\\iota|\\kappa|\\lambda|\\mu|\\nu|\\xi|\\pi|\\varpi|\\rho|\\varrho|\\sigma|\\varsigma|\\tau|\\upsilon|\\phi|\\varphi|\\chi|\\psi|\\omega|\\Gamma|\\Delta|\\Theta|\\Lambda|\\Xi|\\Pi|\\Sigma|\\Upsilon|\\Phi|\\Psi|\\Omega)/1/g;
+    $garbage=~s/(\\pm|\\mp|\\times|\\div|\\cdot|\\ast|\\star|\\dagger|\\ddagger|\\amalg|\\cap|\\cup|\\uplus|\\sqcap|\\sqcup|\\vee|\\wedge|\\oplus|\\ominus|\\otimes|\\circ|\\bullet|\\diamond|\\lhd|\\rhd|\\unlhd|\\unrhd|\\oslash|\\odot|\\bigcirc|\\Box|\\Diamond|\\bigtriangleup|\\bigtriangledown|\\triangleleft|\\triangleright|\\setminus|\\wr)/1/g;
+    $garbage=~s/(\\le|\\ll|\\leq|\\ge|\\geq|\\gg|\\neq|\\doreq|\\sim|\\simeq|\\subset|\\subseteq|\\sqsubset|\\sqsubseteq|\\in|\\vdash|\\models|\\supset|\\supseteq|\\sqsupset|\\sqsupseteq|\\ni|\\dash|\\perp|\\approx|\\cong|\\equiv|\\propto|\\prec|\\preceq|\\parallel|\\asymp|\\smile|\\frown|\\bowtie|\\succ|\\succeq|\\mid)/1/g;
+    $garbage=~s/(\\not<|\\\\not\\le|\\not\\prec|\\not\\preceq|\\not\\subset|\\not\\subseteq|\\not\\sqsubseteq|\\not\\in|\\not>|\\not\\ge|\\not\\succ|\\notsucceq|\\not\\supset|\\notsupseteq|\\not\\sqsupseteq|\\notin|\\not=|\\not\\equiv|\\not\\sim|\\not\\simeq|\\not\\approx|\\not\\cong|\\not\\asymp)/1/g;
+    $garbage=~s/(\\leftarrow|\\gets|\\Leftarrow|\\rightarrow|\\to|\\Rightarrow|\\leftrightarrow|\\Leftrightarrow|\\mapsto|\\hookleftarrow|\\leftharpoonup|\\leftkarpoondown|\\rightleftharpoons|\\longleftarrow|\\Longleftarrow|\\longrightarrow|\\Longrightarrow|\\longleftrightarrow|\\Longleftrightarrow|\\longmapsto|\\hookrightarrow|\\rightharpoonup|\\rightharpoondown|\\uparrow|\\Uparrow|\\downarrow|\\Downarrow|\\updownarrow|\\Updownarrow|\\nearrow|\\searrow|\\swarrow|\\nwarrow)/11/g;
+    $garbage=~s/(\\aleph|\\hbar|\\imath|\\jmath|\\ell|\\wp|\\Re|\\Im|\\mho|\\prime|\\emptyset|\\nabla|\\surd|\\partial|\\top|\\bot|\\vdash|\\dashv|\\forall|\\exists|\\neg|\\flat|\\natural|\\sharp|\\\||\\angle|\\backslash|\\Box|\\Diamond|\\triangle|\\clubsuit|\\diamondsuit|\\heartsuit|\\spadesuit|\\Join|\\infty)/11/g;
+    $garbage=~s/(\\hat{([^}]+)}|\\check{([^}]+)}|\\dot{([^}]+)}|\\breve{([^}]+)}|\\acute{([^}]+)}|\\ddot{([^}]+)}|\\grave{([^}]+)}|\\tilde{([^}]+)}|\\mathring{([^}]+)}|\\bar{([^}]+)}|\\vec{([^}]+)})/$1/g;
+    #remove some other LaTeX command
+    $garbage=~s|\\(\w+)\\|\\|g;	 
+    $garbage=~s|\\(\w+)(\s*)|$2|g;	 	 
+    $garbage=~s|\+|11|g;
+    my  $value=length($garbage);
+    return $value;
+}
+
+
+sub align_latex_image {
+    my ($align, $latex_rendering, $image, $width, $height) = @_;
+    my $currentstring;        # The 1/2 wrapped image.
+    my $closure;              # The closure of the wrappage.
+
+    # if it's none just return it back
+    if ($latex_rendering eq 'none') {
+	return ($image,'');
+    }
+
+    #    If there's an alignment specification we need to honor it here.
+    #    For the horizontal alignments, we will also honor the
+    #    value of the latex specfication.  The default is parbox,
+    #    and that's used for illegal values too.  
+    #    
+    #    Even though we set a default alignment value, the user
+    #    could have given us an illegal value.  In that case we
+    #    just use the default alignment of bottom..
+    $currentstring = '';
+    if      ($align eq "top")    {
+	$currentstring .= '\raisebox{-'.$height.'mm}{'.$image;
+	$closure = '}';
+    } elsif (($align eq "center") || ($align eq "middle")) { # Being kind
+	my $offset = $height/2;
+	$currentstring .= '\raisebox{-'.$offset.'mm}{'.$image;
+	$closure       = '}';
+    } elsif ($align eq "left")   { 
+	if ($latex_rendering eq "parpic") { 
+	    $currentstring .= '\parpic[l]{'.$image;
+	    $closure       = '}';
+	} elsif ($latex_rendering eq "parbox") {
+	    $currentstring .= '\begin{minipage}[l]{'.$width.'mm}'
+		.$image;
+	    $closure = '\end{minipage}';
+	} elsif ($latex_rendering eq "wrapfigure"
+		 || $latex_rendering ne 'none') {  # wrapfig render
+	    $currentstring .= 
+		'\begin{wrapfigure}{l}{'.$width.'mm}'
+		.'\scalebox{1.0}{'.$image;
+	    $closure = '}\end{wrapfigure}';
+	}
+    } elsif ($align eq "right")  {   
+	if ($latex_rendering eq "parpic") {
+	    $currentstring .= '\parpic[r]{'.$image;
+	    $closure = '}';
+	} elsif ($latex_rendering eq "parbox") {
+	    $currentstring .=  '\begin{minipage}[r]{'.$width.'mm}'
+		.$image;
+	    $closure = '\end{minipage}';
+	} elsif ($latex_rendering eq "wrapfigure"
+		 || $latex_rendering ne 'none') {  # wrapfig render
+	    $currentstring .= 
+		'\begin{wrapfigure}{r}{'.$width.'mm}'
+		.'\scalebox{1.0}{'.$image;
+	    $closure = '}\end{wrapfigure}';
+	}
+    } else {		# Bottom is also default.
+	# $currentstring = '\raisebox{'.$height.'mm}{'.$image.'}';
+	$currentstring .= "{$image";
+	$closure       = '}';
+    }
+    return ($currentstring, $closure);
+}
+
+
+sub is_inside_of {
+    my ($tagstack, $tag) = @_;
+    my @stack = @$tagstack;
+    for (my $i = ($#stack - 1); $i >= 0; $i--) {
+	if ($stack[$i] eq $tag) {
+	    return 1;
 	}
+    }
+    return 0;
+}
+
+
+#
+#   This sub provides the typical LaTeX prefix matter for tex output:
+#
+sub latex_header {
+    my ($mode) = @_;
+    my $currentstring = '';
+
+    $currentstring .= 
+	"\n% &Apache::lonxml::londefdef \n" .
+	'\documentclass[letterpaper,twoside]{article}\raggedbottom';
+    if (($env{'form.latex_type'}=~'batchmode') ||
+	(!$env{'request.role.adv'}) || 
+	($mode eq 'batchmode')) {$currentstring .='\batchmode';} 
+    $currentstring .= '\newcommand{\keephidden}[1]{}'.
+	'\renewcommand{\deg}{$^{\circ}$}'.
+	'\usepackage{multirow}'.
+	'\usepackage{longtable}'.
+	'\usepackage{textcomp}'.
+	'\usepackage{makeidx}'.
+	'\usepackage[dvips]{graphicx}'.
+	'\usepackage{wrapfig}'.
+	'\usepackage{picins}'.
+	'\usepackage[T1]{fontenc}'."\n".
+	'\usepackage{lmodern}'."\n".
+	'\usepackage[postscript]{ucs}'."\n".
+	'\usepackage[utf8x]{inputenc}'."\n".
+	'\usepackage{pifont}' ."\n".
+	'\usepackage{latexsym}'."\n".
+	'\usepackage{epsfig}'.
+	"\\usepackage{xtab}\n".
+	"\\usepackage{tabularx}\n".
+	"\\usepackage{booktabs}\n".
+	"\\usepackage{array}\n".
+	"\\usepackage{colortbl}\n".
+	"\\usepackage{xcolor}\n".
+	'\usepackage{calc}'.
+	'\usepackage{amsmath}'.
+	'\usepackage{amssymb}'.
+	'\usepackage{amsfonts}'.
+	'\usepackage{amsthm}'.
+	'\usepackage{amscd}'
+        .'\usepackage{picins}\usepackage{calc}'."\n". # From lonprintout.pm
+	'\usepackage[T1]{fontenc}'."\n".
+	'\usepackage{lmodern}'."\n".
+	'\usepackage[postscript]{ucs}'."\n".
+	'\usepackage[utf8x]{inputenc}'."\n".
+	'\usepackage{pifont}'  . "\n";
+	
+    if($env{'form.pdfFormFields'} eq 'yes') {
+	$currentstring .= '\usepackage{hyperref}'.
+	    '\usepackage{eforms}'.
+	    '\usepackage{tabularx}';
+    } 
+    
+        $currentstring .= '\newenvironment{choicelist}{\begin{list}{}{\setlength{\rightmargin}{0in}\setlength{\leftmargin}{0.13in}\setlength{\topsep}{0.05in}\setlength{\itemsep}{0.022in}\setlength{\parsep}{0in}\setlength{\belowdisplayskip}{0.04in}\setlength{\abovedisplayskip}{0.05in}\setlength{\abovedisplayshortskip}{-0.04in}\setlength{\belowdisplayshortskip}{0.04in}}}{\end{list}}'.
+                          '\renewenvironment{theindex}{\begin{list}{}{{\vskip 1mm \noindent \large\textbf{Index}} \newline \setlength{\rightmargin}{0in}\setlength{\leftmargin}{0.13in}\setlength{\topsep}{0.01in}\setlength{\itemsep}{0.1in}\setlength{\parsep}{-0.02in}\setlength{\belowdisplayskip}{0.01in}\setlength{\abovedisplayskip}{0.01in}\setlength{\abovedisplayshortskip}{-0.04in}\setlength{\belowdisplayshortskip}{0.01in}}}{\end{list}}';
+    $currentstring .= '\begin{document}';
+    
+    return $currentstring;
+
+}
+
+=pod
+
+=head1 NAME
+
+Apache::londefdef.pm
+
+=head1 SYNOPSIS
+
+Tags Default Definition Module
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 NOTABLE SUBROUTINES
+
+=over
+
+=item start_hideweboutput()
+
+=item end_hideweboutput()
+
+=item image_replication()
+
+=item resize_image()
+
+	Get correct sizing parameter for an image given
+	it's initial ht. and wid.  This allows sizing of
+	images that are generated on-the-fly (e.g. gnuplot)
+	as well as serving as a utility for image_size.
+ 
+	Parameter:
+        height_param
+        width_param    - Initial picture dimensions.
+        scaling        - A scale factor.
+        parstack,      - the current stack of tag attributes 
+                         from the xml parser
+        safeeval,      - pointer to the safespace
+        depth,         - from what level in the stack to look for attributes
+                         (assumes -1 if unspecified)
+        cis            - look for attrubutes case insensitively
+                         (assumes false)
+
+	Returns:
+		height, width   - new dimensions.
+
+=item image_size()
+
+=item image_width()
+
+=item image_height()
+
+=item get_eps_image()
+
+=item eps_generation()
+
+=item file_path()
+
+=item recalc()
+
+	Converts a measurement in to mm from any of 
+	the other valid LaTeX units of measure.
+	If the units of measure are missing from the 
+	parameter, it is assumed to be in and returned
+	with mm units of measure
+
+=item LATEX_length()
+
+=item align_latex_image()
+
+  	Wrap image 'stuff' inside of the LaTeX required to implement 
+   	alignment:
+     	align_tex_image(align, latex_rendering, image)
+   	Where:
+     	align   - The HTML alignment specification.
+     	latex_rendering - rendering hint for latex.
+     	image   - The LaTeX needed to insert the image itsef.
+     	width,height - dimensions of the image.
+ 	Returns:
+    	The 1/2 wrapped image and the stuff required to close the
+    	wrappage.  This allows e.g. randomlabel to insert more stuff
+    	into the closure.
+
+
+=item is_inside_of($tagstack, $tag)
+   	This sub returns true if the current state of Xml processing is inside of the tag.   
+	Parameters:
+    	tagstack   - The tagstack from the parser.
+    	tag        - The tag (without the <>'s.).
+	Sample usage:
+    	if (is_inside_of($tagstack "table")) {
+     	   I'm in a table....
+     	}
+
+
+
+=back
+
+=cut
+
+
 1;
 __END__