diff -ur jsMath-2.3b-lowercase/jsMath.js jsMath-2.3b-xhtml/jsMath.js
--- jsMath-2.3b-lowercase/jsMath.js	2005-10-30 11:14:09.000000000 -0800
+++ jsMath-2.3b-xhtml/jsMath.js	2005-10-29 13:58:55.000000000 -0700
@@ -270,14 +270,14 @@
         else {document.body.insertBefore(div,document.body.firstChild)}
     } catch (err) {
       var html = '<div id="jsMath.'+id+'"';
-      for (var id in attributes) {html += ' '+id+'="'+attributes[id]+'"'}
+      for (var id2 in attributes) {html += ' '+id2+'="'+attributes[id2]+'"'}
       if (styles) {
         html += ' style="';
-        for (var id in styles) {html += ' '+id+':'+styles[id]+';'}
+        for (var id2 in styles) {html += ' '+id2+':'+styles[id2]+';'}
         html += '"';
       }
       html += '</div>';
-      if (!document.body.insertAdjacentHTML) {document.write(html)}
+      if (!document.body.insertAdjacentHTML) {jsMath.write(html)}
         else {document.body.insertAdjacentHTML('AfterBegin',html)}
       div = jsMath.Element(id);
     }
@@ -2143,7 +2144,7 @@
    */
   Rule: function (w,h) {
     if (h == null) {h = jsMath.TeX.default_rule_thickness}
-    if (w == 0 || h == 0) return;  // should make an invisible box?
+    if (w == 0 || h == 0) return '';  // should make an invisible box?
     w *= jsMath.Browser.imgScale;
     h = Math.round(h*jsMath.em*jsMath.Browser.imgScale+.25);
     if (h < 1) {h = 1};
@@ -2385,7 +2386,7 @@
    */
   Rule: function (w,h) {
     if (h == null) {h = jsMath.TeX.default_rule_thickness}
-    html = jsMath.HTML.Rule(w,h);
+    var html = jsMath.HTML.Rule(w,h);
     return new jsMath.Box('html',html,w,h,0);
   },
 
@@ -2410,7 +2411,7 @@
    *  Return the character, font, style and actual height used.
    */
   DelimBestFit: function (H,c,font,style) {
-    if (c == 0 && font == 0) return;
+    if (c == 0 && font == 0) return null;
     var C; var h; font = jsMath.TeX.fam[font];
     var isSS = (style.charAt(1) == 'S');
     var isS  = (style.charAt(0) == 'S');
@@ -2424,6 +2425,7 @@
       if (h >= H || C.n == null) {return [c,font,'T',h]}
       c = C.n
     }
+    return null;
   },
   
   /*
@@ -3066,7 +3068,7 @@
    *  contains an \over (or \above, etc).
    */
   Over: function () {
-    var over = this.data.overI; var from = this.data.overF
+    var over = this.data.overI; var from = this.data.overF;
     var atom = jsMath.mItem.Fraction(from.name,
       {type: 'mlist', mlist: this.Range(open+1,over-1)},
       {type: 'mlist', mlist: this.Range(over)},
@@ -4497,7 +4499,7 @@
   Process: function (arg) {
     var data = this.mlist.data;
     arg = jsMath.Parse(arg,data.font,data.size,data.style);
-      if (arg.error) {this.Error(arg); return}
+      if (arg.error) {this.Error(arg); return null}
     if (arg.mlist.Length() == 0) {return null}
     if (arg.mlist.Length() == 1) {
       var atom = arg.mlist.Last();
@@ -4515,7 +4517,8 @@
     var letter = /^([a-z]+|.) ?/i;
     var cmd = letter.exec(this.string.slice(this.i));
     if (cmd) {this.i += cmd[1].length; return cmd[1]}
-    this.Error("Missing control sequnece name at end of string or argument"); return
+    this.Error("Missing control sequnece name at end of string or argument"); 
+    return null;
   },
 
   /*
@@ -4524,8 +4527,8 @@
    */
   GetArgument: function (name,noneOK) {
     while (this.nextIsSpace()) {this.i++}
-    if (this.i >= this.string.length) {if (!noneOK) this.Error("Missing argument for "+name); return}
-    if (this.string.charAt(this.i) == this.close) {if (!noneOK) this.Error("Extra close brace"); return}
+    if (this.i >= this.string.length) {if (!noneOK) this.Error("Missing argument for "+name); return null}
+    if (this.string.charAt(this.i) == this.close) {if (!noneOK) this.Error("Extra close brace"); return null}
     if (this.string.charAt(this.i) == this.cmd) {this.i++; return this.cmd+this.GetCommand()}
     if (this.string.charAt(this.i) != this.open) {return this.string.charAt(this.i++)}
     var j = ++this.i; var pcount = 1; var c = '';
@@ -4534,18 +4537,19 @@
       if (c == this.cmd) {this.i++}
       else if (c == this.open) {pcount++}
       else if (c == this.close) {
-        if (pcount == 0) {this.Error("Extra close brace"); return}
+        if (pcount == 0) {this.Error("Extra close brace"); return null}
         if (--pcount == 0) {return this.string.slice(j,this.i-1)}
       }
     }
     this.Error("Missing close brace");
+    return null;
   },
 
   /*
    *  Get an argument and process it into an mList
    */
   ProcessArg: function (name) {
-    var arg = this.GetArgument(name); if (this.error) return;
+    var arg = this.GetArgument(name); if (this.error) return null;
     return this.Process(arg);
   },
 
@@ -4557,10 +4561,11 @@
     var c = this.string.charAt(this.i);
     if (this.i < this.string.length) {
       this.i++;
-      if (c == this.cmd) {c = '\\'+this.GetCommand(name); if (this.error) return}
+      if (c == this.cmd) {c = '\\'+this.GetCommand(name); if (this.error) return null}
       if (this.delimiter[c] != null) {return this.delimiter[c]}
     }
     this.Error("Missing or unrecognized delimiter for "+name);
+    return null;
   },
   
   /*
@@ -4578,7 +4583,7 @@
       advance = 1;
     }
     var match = rest.match(/^\s*([-+]?(\.\d+|\d+(\.\d*)?))(pt|em|ex|mu|px)/);
-    if (!match) {this.Error("Missing dimension or its units for "+name); return}
+    if (!match) {this.Error("Missing dimension or its units for "+name); return null}
     if (advance) {
       this.i += match[0].length;
       if (this.nextIsSpace()) {this.i++}
@@ -4610,7 +4615,7 @@
       if (c == '{') {pcount++}
       else if (c == '}') {
         if (pcount == 0)
-          {this.Error("Extra close brace while looking for ']'"); return}
+          {this.Error("Extra close brace while looking for ']'"); return null}
         pcount --;
       } else if (c == this.cmd) {
         this.i++;
@@ -4619,6 +4624,7 @@
       }
     }
     this.Error("Couldn't find closing ']' for argument to "+this.cmd+name);
+    return null;
   },
   
   /*
@@ -4632,7 +4638,7 @@
       if (c == '{') {pcount++}
       else if (c == '}') {
         if (pcount == 0)
-          {this.Error("Extra close brace while looking for "+this.cmd+token); return}
+          {this.Error("Extra close brace while looking for "+this.cmd+token); return null}
         pcount --;
       } else if (c == this.cmd) {
         // really need separate counter for begin/end
@@ -4655,6 +4661,7 @@
       }
     }
     this.Error("Couldn't find "+this.cmd+token+" for "+name);
+    return null;
   },
 
   /*
@@ -4662,7 +4669,7 @@
    *  process it to get its mlist
    */
   ProcessUpto: function (name,token) {
-    var arg = this.GetUpto(name,token); if (this.error) return;
+    var arg = this.GetUpto(name,token); if (this.error) return null;
     return this.Process(arg);
   },
 
@@ -4672,8 +4679,8 @@
   GetEnd: function (env) {
     var body = ''; var name = '';
     while (name != env) {
-      body += this.GetUpto('begin{'+env+'}','end'); if (this.error) return;
-      name = this.GetArgument(this.cmd+'end'); if (this.error) return;
+      body += this.GetUpto('begin{'+env+'}','end'); if (this.error) return null;
+      name = this.GetArgument(this.cmd+'end'); if (this.error) return null;
     }
     return body;
   },