--- loncom/html/adm/jsMath/plugins/tex2math.js	2006/03/27 19:32:29	1.2
+++ loncom/html/adm/jsMath/plugins/tex2math.js	2006/05/17 22:19:38	1.3
@@ -145,6 +145,7 @@ jsMath.Add(jsMath.tex2math,{
     if (!element) {element = jsMath.document.body}
     if (typeof(element) == 'string') {element = jsMath.document.getElementById(element)}
     while (element) {
+      if (element.className == null) {element.className = ''}
       if (element.nodeName == '#text') {
         if (!ignore) {element = this.ScanText(element)}
       } else if (element.firstChild && element.className != 'math') {
@@ -170,6 +171,7 @@ jsMath.Add(jsMath.tex2math,{
       this.pattern.lastIndex = 0;
       while (element && element.nodeName == '#text' &&
             (match = this.pattern.exec(element.nodeValue))) {
+        this.pattern.match = match;
         element = this.ProcessMatch(match[0],match.index,element);
       }
       if (this.search.matched) {element = this.EncloseMath(element)}
@@ -196,14 +198,16 @@ jsMath.Add(jsMath.tex2math,{
     } else {
       switch (match) {
         case '\\(':
-          if (this.search.end != '$' && this.search.end != '$$' &&
+          if (this.search.end == null ||
+             (this.search.end != '$' && this.search.end != '$$') &&
               this.processSlashParens) {
             this.ScanMark('span',element,'\\)');
           }
           break;
 
         case '\\[':
-          if (this.search.end != '$' && this.search.end != '$$' &&
+          if (this.search.end == null ||
+             (this.search.end != '$' && this.search.end != '$$') &&
               this.processSlashBrackets) {
             this.ScanMark('div',element,'\\]');
           }
@@ -259,7 +263,7 @@ jsMath.Add(jsMath.tex2math,{
    *  for the math element, and the end delimiter we want to find.
    */
   ScanMark: function (type,element,end) {
-    var len = RegExp.$1.length;
+    var len = this.pattern.match[1].length;
     this.search = {
       type: type, end: end, open: element, olength: len,
       pos: this.pattern.lastIndex - len