--- loncom/interface/lonindexer.pm	2006/06/08 13:56:31	1.145
+++ loncom/interface/lonindexer.pm	2007/07/06 08:34:37	1.169
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Directory Indexer
 #
-# $Id: lonindexer.pm,v 1.145 2006/06/08 13:56:31 www Exp $
+# $Id: lonindexer.pm,v 1.169 2007/07/06 08:34:37 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -54,6 +54,7 @@ use Apache::File;
 use Apache::lonlocal;
 use Apache::lonsource();
 use GDBM_File;
+use LONCAPA qw(:match);
 
 # ---------------------------------------- variables used throughout the module
 my %hash; # global user-specific gdbm file
@@ -123,7 +124,10 @@ sub handler {
     %hash = ();
     {
 	my %dbfile;
-	if (tie(%dbfile,'GDBM_File',$diropendb,&GDBM_READER(),0640)) {
+	if (tie(%dbfile,'GDBM_File',$diropendb,&GDBM_WRITER(),0640)) {
+	    if ($env{'form.launch'} eq '1') {
+		&start_fresh_session(\%dbfile);
+	    }
 	    while(my($key,$value)=each(%dbfile)) {
 		$hash{$key}=$value;
 	    }
@@ -131,9 +135,6 @@ sub handler {
 	}
     }
     {
-	if ($env{'form.launch'} eq '1') {
-	    &start_fresh_session();
-	}
   #Hijack lonindexer to verify a title and be close down.
    if ($env{'form.launch'} eq '2') {
        &Apache::loncommon::content_type($r,'text/html');
@@ -171,8 +172,8 @@ ENDSUBM
 # --------------------- define extra fields and buttons in case of special mode
 	if ($env{'form.catalogmode'} eq 'interactive') {
 	    $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
-		'<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
-		' border="0" /></td>';
+		'<img alt="" src="'.$iconpath.'whitespace1.gif"'.
+		' class="LC_icon" /></td>';
 	    $colspan=" colspan='2' ";
             my $cl=&mt('Close');
             $closebutton=<<END;
@@ -181,8 +182,8 @@ END
         }
 	elsif ($env{'form.catalogmode'} eq 'import') {
 	    $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
-		'<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
-		' border="0" /></td>';
+		'<img alt="" src="'.$iconpath.'whitespace1.gif"'.
+		' class="LC_icon" /></td>';
 	    $colspan=" colspan='2' ";
 	    my $cl=&mt('Close');
             my $gi=&mt('Import');
@@ -348,6 +349,32 @@ END
 	my $js = <<"ENDHEADER";
 <script type="text/javascript">
 $catalogmodefunctions
+function checkAll() {
+    var numForms = document.forms.length;
+    for (i=0;i<numForms;i++) {
+        var numElements = document.forms[i].elements.length;
+        for (j=0;j<numElements;j++){
+            var fieldName = document.forms[i].elements[j].name;
+            if (fieldName == 'filelink') {
+                document.forms[i].elements[j].checked = true;
+                queue(document.forms[i].name);
+            }
+        }
+    }
+}
+function uncheckAll() {
+    var numForms = document.forms.length;
+    for (i=0;i<numForms;i++) {
+        var numElements = document.forms[i].elements.length;
+        for (j=0;j<numElements;j++){
+            var fieldName = document.forms[i].elements[j].name;
+            if (fieldName == 'filelink') {
+                document.forms[i].elements[j].checked = false;
+                queue(document.forms[i].name);
+            }
+        }
+    }
+}
 function openWindow(url, wdwName, w, h, toolbar,scrollbar,locationbar) {
     var xpos = (screen.width-w)/2;
     xpos = (xpos < 0) ? '0' : xpos;
@@ -365,7 +392,7 @@ function gothere(val) {
 </script>
 ENDHEADER
 
-        my ($headerdom)=($uri=~/^\/res\/(\w+)\//);
+        my ($headerdom)=($uri=~m{^/res/($match_domain)/});
 	$r->print(&Apache::loncommon::start_page('Browse Resources',$js,
 						 {'domain' => $headerdom,}));
 # - Evaluate actions from previous page (both cumulatively and chronologically)
@@ -383,11 +410,10 @@ ENDHEADER
 		$ac++;
 	    }
 	    # sorting through the actions and changing the global database hash
-	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
-		my $key=$_;
+	    foreach my $key (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
 		if ($ahash{$key} eq '1') {
 		    $hash{'store_'.$hash{'pre_'.$key.'_link'}}=
-			$hash{'pre_'.$key.'_title'};
+		       $hash{'pre_'.$key.'_title'};
 		    $hash{'storectr_'.$hash{'pre_'.$key.'_link'}}=
 			$hash{'storectr'}+0;
 		    $hash{'storectr'}++;
@@ -497,6 +523,9 @@ END
 # ------------------------------------------------------ Remember where we were
 	&Apache::loncommon::storeresurl($storeuri);
 	&Apache::lonhtmlcommon::store_recent('residx',$storeuri,$storeuri);
+# -------------------------------------------------- Check All and Uncheck all
+	$r->print('<br /><input type="button" value="'.&mt("Check All").'" id="checkallbutton" onClick="javascript:checkAll()" />');
+	$r->print('<input type="button" value="'.&mt("Uncheck All").'" id="uncheckallbutton" onClick="javascript:uncheckAll()" />');
 # ----------------- output starting row to the indexed file/directory hierarchy
         my $titleclr="#ddffff";
         #$r->print(&initdebug());
@@ -579,12 +608,13 @@ END
 # -------- recursively go through all the directories and output as appropriate
 	&scanDir ($r,$toplevel,$indent,\%hash);
 	
-# ---------------------------- embed hidden information useful for group import
-	$r->print("<form name='fnum'>");
-	$r->print("<input type='hidden' name='fnum' value='$fnum' /></form>");
 
 # -------------------------------------------------------------- end the tables
 	$r->print('</table>');
+# ---------------------------- embed hidden information useful for group import
+	$r->print("<form name='fnum' action=''>");
+	$r->print("<input type='hidden' name='fnum' value='$fnum' /></form>");
+# -------------------------------------------------------------- end the tables
 	$r->print('</td></tr></table>');
 
 # --------------------------------------------------- end the output and return
@@ -677,7 +707,7 @@ sub get_list {
 	$uri=~s/\/+/\//g;
 	foreach (&Apache::lonsequence::attemptread(&Apache::lonnet::filelocation('',$uri))) {
 	    my @ratpart=split(/\:/,$_);
-	    push @list,$ratpart[1];
+	    push(@list,&LONCAPA::map::qtescape($ratpart[1]));
 	} 
 	$hash{'dirlist_files_'.$luri} = join("\n",@list);
     } else {
@@ -686,7 +716,7 @@ sub get_list {
 	$hash{'dirlist_files_'.$luri} = join("\n",@list);
 	$hash{'dirlist_timestamp_files_'.$luri} = time;
     }
-    return @list=&match_ext($r,@list);
+    return @list=&match_ext($r,@list);    
 }
 
 sub dynmetaread {
@@ -796,7 +826,8 @@ sub display_line {
     my $i=0;
     while ($i<=11) {
 	$tabtag=join('',$tabtag,"<td>&nbsp;</td>")
-	    if $hash{'display_attrs_'.$i} == 1;
+	    if ($i != 9 &&
+		$hash{'display_attrs_'.$i} == 1);
 	$i++;
     }
     my $valign = ($hash{'display_attrs_7'} == 1 ? 'top' : 'bottom');
@@ -808,7 +839,7 @@ sub display_line {
 	$updir='/'.(split(/\.(page|sequence)\/\//,$startdir))[-1];
 	$updir=~s/\/+/\//g;
 
-	$r->print("<tr valign='$valign' bgcolor=$fileclr>$extrafield");
+	$r->print("<tr valign='$valign' bgcolor=\"$fileclr\">$extrafield");
 	$r->print("<td>\n");
 	$r->print ('<form method="post" name="dirpathUP" action="'.$updir.
 		   '/" '.
@@ -820,7 +851,7 @@ sub display_line {
 		   $startdir.'" />'."\n");
 	$r->print ('<input type="hidden" name="acts" value="" />'."\n");
 	$r->print ('<input src="'.$iconpath.'arrow_up.gif"');
-	$r->print (' name="'.$msg.'" height="22" type="image" border="0" />'.
+	$r->print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
 		   "\n");
 	$r->print(&mt("Up")."</form>$tabtag</tr>\n");
 	return OK;
@@ -836,24 +867,24 @@ sub display_line {
     if ($filecom[1] eq 'domain') {
  	$r->print ('<input type="hidden" name="dirPointer" value="on" />'."\n")
  	    if ($env{'form.dirPointer'} eq "on");
-	$r->print("<tr valign='$valign' bgcolor=$fileclr>$extrafield");
+	$r->print("<tr valign='$valign' bgcolor=\"$fileclr\">$extrafield");
 	$r->print("<td>");
 	&begin_form ($r,$filecom[0]);
 	my $anchor = $filecom[0];
-	$anchor =~ s/\///g;
-	$r->print ('<a name="'.$anchor.'">');
+	$anchor =~ s/\W//g;
+	$r->print ('<a name="'.$anchor.'"></a>');
 	$r->print ('<input type="hidden" name="acts" value="" />');
 	$r->print ('<input src="'.$iconpath.'folder_pointer_'.
 		   $diropen.'.gif"'); 
-	$r->print (' name="'.$msg.'" height="22" type="image" border="0" />'.
+	$r->print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
 		   "\n");
 	my $quotable_filecom = &Apache::loncommon::escape_single($filecom[0]);
 	$r->print ('<a href="javascript:gothere(\''.$quotable_filecom.
-		   '\')"><img src="'.$iconpath.'server.gif"');
-	$r->print (' border="0" /></a>'."\n");
+		   '\')"><img alt="" src="'.$iconpath.'server.gif"');
+	$r->print (' class="LC_icon" /></a>'."\n");
 	$r->print (&mt("Domain")." - $listname ");
-	if ($Apache::lonnet::domaindescription{$listname}) {
-	    $r->print("(".$Apache::lonnet::domaindescription{$listname}.
+	if (&Apache::lonnet::domain($listname,'description')) {
+	    $r->print("(".&Apache::lonnet::domain($listname,'description').
 		      ")");
 	}
 	$r->print ("</form>$tabtag</tr>\n");
@@ -862,24 +893,23 @@ sub display_line {
 # display user directory
     }
     if ($filecom[1] eq 'user') {
-	$r->print("<tr valign=$valign bgcolor=$fileclr>$extrafield");
-	$r->print("<td nowrap>\n");
+	# $r->print("<tr valign=$valign bgcolor=\"$fileclr\">$extrafield");
 	my $curdir = $startdir.$filecom[0].'/';
 	my $anchor = $curdir;
-	$anchor =~ s/\///g;
+	$anchor =~ s/\W//g;
+	$r->print("<tr bgcolor=\"$fileclr\">$extrafield<td valign=$valign>");
 	&begin_form ($r,$curdir);
-	$r->print ('<a name="'.$anchor.'"><img src="'.$iconpath.
-		   'whitespace1.gif" border="0" />'."\n");
+	$r->print ('<a name="'.$anchor.'"></a><img alt="" src="'.$iconpath.
+		   'whitespace1.gif" class="LC_icon" />'."\n");
 	$r->print ('<input type="hidden" name="acts" value="" />');
 	$r->print ('<input src="'.$iconpath.'folder_pointer_'.$diropen.
 		   '.gif"'); 
-	$r->print (' name="'.$msg.'" height="22" type="image" border="0" />'.
+	$r->print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
 		   "\n");
 	my $quotable_curdir = &Apache::loncommon::escape_single($curdir);
 	$r->print ('<a href="javascript:gothere(\''.$quotable_curdir
-		   .'\')"><img src='.
-		   $iconpath.'quill.gif border="0" name="'.$msg.
-		   '" height="22" /></a>');
+		   .'\')"><img alt="'.$msg.'" src="'.
+		   $iconpath.'quill.gif" class="LC_indexer_icon" /></a>');
 	my $domain=(split(m|/|,$startdir))[2];
 	my $plainname=&Apache::loncommon::plainname($listname,$domain);
 	$r->print ($listname);
@@ -890,7 +920,11 @@ sub display_line {
 
 # display file
     if (($fnptr == 0 and $filecom[3] ne '') or $absolute) {
+        my $title;
 	my $filelink = $pathprefix.$filecom[0];
+	if ($hash{'display_attrs_0'} == 1) {
+	    $title = &Apache::lonnet::gettitle($filelink);
+	}
 	my @file_ext = split (/\./,$listname);
 	my $curfext = $file_ext[-1];
         if (@Omit) {
@@ -903,17 +937,17 @@ sub display_line {
         }
 	# Set the icon for the file
 	my $iconname = &Apache::loncommon::icon($listname);
-	$r->print("<tr valign='$valign' bgcolor=$fileclr><td nowrap='nowrap' valign='top'>");
+	$r->print("<tr valign='$valign' bgcolor=\"$fileclr\"><td nowrap='nowrap' valign='top'>");
 	
         if ($env{'form.catalogmode'} eq 'interactive') {
 	    my $quotable_filelink = &Apache::loncommon::escape_single($filelink);
             $r->print("<a href=\"javascript:select_data(\'",
                       $quotable_filelink,"')\">");
-	    $r->print("<img src='",$iconpath,"select.gif' border='0' /></a>".
+	    $r->print("<img alt=\"\" src='",$iconpath,"select.gif' class='LC_icon' /></a>".
 		      "\n");
-	    $r->print("</td><td nowrap>");
+	    $r->print("</td><td nowrap='nowrap' valign='top'>");
 	} elsif ($env{'form.catalogmode'} eq 'import') {
-	    $r->print("<form name='form$fnum'>\n");
+	    $r->print("<form name='form$fnum' action=''>\n");
 	    $r->print("<input type='checkbox' name='filelink"."' ".
 		      "value='$filelink' onClick='".
 		      "javascript:queue(\"form$fnum\")' ");
@@ -921,64 +955,65 @@ sub display_line {
 		$r->print("checked");
 	    }
 	    $r->print(" />\n");
-	    $r->print("</form></td><td nowrap>");
+	    $r->print("</form></td><td nowrap='nowrap' valign='top'>");
 	    $hash{"pre_${fnum}_link"}=$filelink;
+	    $hash{"pre_${fnum}_title"}=$title;
+	    if (!$hash{"pre_${fnum}_title"}) {
+	        $hash{"pre_${fnum}_title"} = 'Not_retrieved';
+	    }
   	    $fnum++;
 	}
 # Form to open or close sequences
 	if ($filelink=~/\.(page|sequence)$/) {
 	    my $curdir = $startdir.$filecom[0].'/';
-	    my $anchor = $curdir;
-	    $anchor =~ s/\///g;
 	    &begin_form($r,$curdir);
 	    $indent--;
 	}
 # General indentation
 	if ($indent > 0 and $indent < 11) {
-	    $r->print("<img src=",$iconpath,"whitespace",$indent,
-		      ".gif border='0' />\n");
+	    $r->print("<img alt=\"\" src='",$iconpath,"whitespace",$indent,
+		      ".gif' class='LC_icon' />\n");
 	} elsif ($indent >0) {
 	    my $ten = int($indent/10.);
 	    my $rem = $indent%10.0;
 	    my $count = 0;
 	    while ($count < $ten) {
-		$r->print("<img src=",$iconpath,
-			  "whitespace10.gif border='0' />\n");
+		$r->print("<img alt=\"\" src=".$iconpath.
+			  "whitespace10.gif class='LC_icon' />\n");
 	    $count++;
 	    }
-	    $r->print("<img src=",$iconpath,"whitespace",$rem,
-		      ".gif border='0' />\n") if $rem > 0;
+	    $r->print("<img alt=\"\" src=",$iconpath,"whitespace",$rem,
+		      ".gif class='LC_icon' />\n") if $rem > 0;
 	}
 # Sequence open/close icon
 	if ($filelink=~/\.(page|sequence)$/) {
 	    my $curdir = $startdir.$filecom[0].'/';
 	    my $anchor = $curdir;
-	    $anchor =~ s/\///g;
+	    $anchor =~ s/\W//g;
 	    $r->print ('<input type="hidden" name="acts" value="" />');
-	    $r->print ('<a name="'.$anchor.'"><input src="'.$iconpath.
+	    $r->print ('<a name="'.$anchor.'"></a><input src="'.$iconpath.
 		       'folder_pointer_'.$diropen.'.gif"');
-	    $r->print (' name="'.$msg.'" height="22" type="image" border="0" />'.
+	    $r->print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
 		       "\n");
 	}
 # Filetype icons
-	$r->print("<img src='$iconname' border='0' />\n");
+	$r->print("<img alt=\"\" src='$iconname' class='LC_icon' />\n");
 	my $quotable_filelink = &Apache::loncommon::escape_single($filelink);
 
 
 	$r->print (" <a href=\"javascript:openWindow('".$quotable_filelink.
-		   "', 'previewfile', '450', '500', 'no', 'yes','yes')\";".
-		   " TARGET=_self>$listname</a> ");
+		   "','previewfile','450','500','no','yes','yes');\"".
+		   " target=\"_self\">$listname</a> ");
 
 	$r->print (" (<a href=\"javascript:openWindow('".$quotable_filelink.
-		   ".meta', 'metadatafile', '500', '550', 'no', 'yes','no')\"; ".
-		   "TARGET=_self>metadata</a>) ");
+		   ".meta','metadatafile','500','550','no','yes','no');\" ".
+		   " target=\"_self\">metadata</a>) ");
 # Close form to open/close sequence
 	if ($filelink=~/\.(page|sequence)$/) {
 	    $r->print('</form>');
 	}
 	$r->print("</td>\n");
 	if ($hash{'display_attrs_0'} == 1) {
-	    my $title = &Apache::lonnet::gettitle($filelink,'title');
 	    $r->print('<td> '.($title eq '' ? '&nbsp;' : $title).
 		      ' </td>'."\n");
 	}
@@ -1036,8 +1071,8 @@ sub display_line {
 		my $quotable_sourcelink = &Apache::loncommon::escape_single($sourcelink);
 		$r->print('<td>'."<a href=\"javascript:openWindow('"
 			  .$quotable_sourcelink.
-			  "', 'previewsource', '700', '700', 'no', 'yes','yes')\";".
-			  " TARGET=_self>Yes</a> "."</td>\n");
+			  "', 'previewsource', '700', '700', 'no', 'yes','yes');\"".
+			  " target=\"_self\">Yes</a> "."</td>\n");
 	    } else { #A cuddled else. :P
 		$r->print("<td>&nbsp;</td>\n");
 	    }
@@ -1046,6 +1081,7 @@ sub display_line {
 # links
 	   &dynmetaread($filelink);
 	   $r->print('<td>');
+	   &coursecontext($r,$filelink);
 	   &dynmetaprint($r,$filelink,'goto_list');
 	   &dynmetaprint($r,$filelink,'comefrom_list');
 	   &dynmetaprint($r,$filelink,'sequsage_list');
@@ -1066,41 +1102,42 @@ sub display_line {
     if ($fnptr == $dirptr) {
 	my $curdir = $startdir.$filecom[0].'/';
 	my $anchor = $curdir;
-	$anchor =~ s/\///g;
-	$r->print("<tr bgcolor=$fileclr>$extrafield<td valign=$valign>");
+	$anchor =~ s/\W//g;
+	$r->print("<tr bgcolor=\"$fileclr\">$extrafield<td valign=$valign>");
 	&begin_form ($r,$curdir);
 	my $indentm1 = $indent-1;
 	if ($indentm1 < 11 and $indentm1 > 0) {
-	    $r->print("<img src=",$iconpath,"whitespace",$indentm1,
-		      ".gif border='0' />\n");
+	    $r->print("<img alt=\"\" src=",$iconpath,"whitespace",$indentm1,
+		      ".gif class='LC_icon' />\n");
 	} else {
 	    my $ten = int($indentm1/10.);
 	    my $rem = $indentm1%10.0;
 	    my $count = 0;
 	    while ($count < $ten) {
-		$r->print ("<img src=",$iconpath
-			   ,"whitespace10.gif border='0' />\n");
+		$r->print ("<img alt=\"\" src=",$iconpath
+			   ,"whitespace10.gif class='LC_icon' />\n");
 		$count++;
 	    }
-	    $r->print ("<img src=",$iconpath,"whitespace",$rem,
-		       ".gif border='0' />\n") if $rem > 0;
+	    $r->print ("<img alt=\"\" src=",$iconpath,"whitespace",$rem,
+		       ".gif class='LC_icon' />\n") if $rem > 0;
 	}
 	$r->print ('<input type="hidden" name="acts" value="" />');
-	$r->print ('<a name="'.$anchor.'"><input src="'.$iconpath.
+	$r->print ('<a name="'.$anchor.'"></a><input src="'.$iconpath.
 		   'folder_pointer_'.$diropen.'.gif"');
-	$r->print (' name="'.$msg.'" height="22" type="image" border="0" />'.
+	$r->print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
 		   "\n");
 	my $quotable_curdir = &Apache::loncommon::escape_single($curdir);
 	$r->print ('<a href="javascript:gothere(\''
-		   .$quotable_curdir.'\')"><img src="'.
-		   $iconpath.'folder_'.$diropen.'.gif" border="0" /></a>'.
+		   .$quotable_curdir.'\')">'
+		   .'<img alt="'.&mt('Open Folder').'"src="'.
+		   $iconpath.'folder_'.$diropen.'.gif" class="LC_icon" /></a>'.
 		   "\n");
-	$r->print ("$listname</td>\n");
+	$r->print ("$listname</form></td>\n");
 # Attributes
 	my $filelink = $startdir.$filecom[0].'/default';
 
 	if ($hash{'display_attrs_0'} == 1) {
-	    my $title = &Apache::lonnet::gettitle($filelink,'title');
+	    my $title = &Apache::lonnet::gettitle($filelink);
 	    $r->print('<td> '.($title eq '' ? '&nbsp;' : $title).
 		      ' </td>'."\n");
 	}
@@ -1143,13 +1180,27 @@ sub display_line {
 	if ($hash{'display_attrs_7'} == 1) {
 	   $r->print('<td>&nbsp;</td>');
         }
-	$r->print('</form></tr>');
+	$r->print('</tr>');
     }
 
 }
 
+sub coursecontext {
+    my ($r,$filelink)=@_;
+    my $filesymb=&Apache::lonnet::symbread($filelink);
+    if ($filesymb) {
+	my ($map,$index,$resource)=&Apache::lonnet::decode_symb($filesymb);
+	$r->print(&mt('Already in this course:<br />[_1] in folder/map [_2].<br />',
+	      &Apache::lonnet::gettitle($resource),
+	      &Apache::lonnet::gettitle($map)));
+    }
+}
+
 sub showpreview {
     my ($filelink)=@_;
+    if ($filelink=~m-^(/ext/|http://)-) {
+	return &mt('External Resource, preview not enabled');
+    }
     my ($curfext)=($filelink=~/\.(\w+)$/);
     my $output='';
     my $embstyle=&Apache::loncommon::fileembstyle($curfext);
@@ -1162,10 +1213,17 @@ sub showpreview {
           $output=join("\n",<FH>);
           close(FH);
        } else {
+# In update display mode, remove old cache. This is done to retroactively
+# clean up course context renderings.
+	  if (-e $cache) {
+	       unlink($cache);
+	  }
           $output=&Apache::lonnet::ssi_body($filelink);
+# Is access denied? Don't render, don't store
           if ($output=~/LONCAPAACCESSCONTROLERRORSCREEN/s) {
              $output='';
-          } else {
+# Was this rendered in course content? Don't store
+          } elsif (!&Apache::lonnet::symbread($filelink)) {
              open(FH,">$cache");
              print FH $output;
              close(FH);
@@ -1173,10 +1231,10 @@ sub showpreview {
        }
        $output='<font size="-2">'.$output.'</font>';
     } elsif ($embstyle eq 'img') {
-       $output='<img src="'.$filelink.'" />';
-    } elsif ($filelink=~/^\/res\/(\w+)\/(\w+)\//) {
-       $output='<img src="http://'.
-                 $Apache::lonnet::hostname{&Apache::lonnet::homeserver($2,$1)}.
+       $output='<img alt="'.&mt('Preview').'" src="'.$filelink.'" />';
+    } elsif ($filelink=~m{^/res/($match_domain)/($match_username)/}) {
+       $output='<img  alt="'.&mt('Preview').'" src="http://'.
+                 &Apache::lonnet::hostname(&Apache::lonnet::homeserver($2,$1)).
                  '/cgi-bin/thumbnail.gif?url='.$filelink.'" />';
     }
     return $output;
@@ -1198,7 +1256,8 @@ sub dynmetaprint {
 sub begin_form {
     my ($r,$uri) = @_;
     my $anchor = $uri;
-    $anchor =~ s/\///g;
+    $anchor =~ s/\W//g;
+    $uri=&Apache::loncommon::escape_single($uri);
     $r->print ('<form method="post" name="dirpath'.$dnum.'" action="'.$uri.
 	       '#'.$anchor.
 	       '" onSubmit="return rep_dirpath(\''.$dnum.'\''.
@@ -1212,14 +1271,15 @@ sub begin_form {
 
 # --------- settings whenever the user causes the indexer window to be launched
 sub start_fresh_session {
-    delete $hash{'form.catalogmode'};
-    delete $hash{'form.mode'};
-    delete $hash{'form.form'};
-    delete $hash{'form.element'};
-    delete $hash{'form.omit'};
-    delete $hash{'form.only'};
-    foreach (keys %hash) {
-        delete $hash{$_} if (/^(pre_|store)/);
+    my ($hash) = @_;
+    delete $hash->{'form.catalogmode'};
+    delete $hash->{'form.mode'};
+    delete $hash->{'form.form'};
+    delete $hash->{'form.element'};
+    delete $hash->{'form.omit'};
+    delete $hash->{'form.only'};
+    foreach (keys %{$hash}) {
+        delete $hash->{$_} if (/^(pre_|store)/);
     }
 }