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diff --git a/jsMath/extensions/bbox.js b/jsMath/extensions/bbox.js
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+++ b/jsMath/extensions/bbox.js
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+/*
+ *  extensions/bbox.js
+ *  
+ *  Part of the jsMath package for mathematics on the web.
+ *
+ *  This file implements the \bbox macro, which creates an HTML box that
+ *  can be styled (for background colors, and so on).  You can include
+ *  an optional dimension that tells how much extra padding to include
+ *  around the bounding box for the mathematics.  E.g.,
+ *  
+ *    \bbox[2pt]{x+y}        %  an invisible box around x+y with 2pt of extra space
+ *    \bbox[green]{x+y}      %  a green box around x+y
+ *    \bbox[green,2pt]{x+y}  %  a green box with 2pt of extra space
+ *    \bbox[yellow,2pt,border:1px solid red]{x+y}
+ *                           %  a yellow box with a red border and 2pt space
+ *  
+ *  This extension is loaded automatically when needed, or you can call
+ *  it directly via
+ *  
+ *    jsMath.Extension.Require('bbox');
+ *  
+ *  ---------------------------------------------------------------------
+ *
+ *  Copyright 2006 by Davide P. Cervone
+ * 
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/********************************************************************/
+
+jsMath.Add(jsMath.HTML,{
+
+  /*
+   *  Create a colored bbounding box
+   */
+  BBox: function (w,h,d,c,s) {
+    if (w <= 0) {return ''}
+    if (d == null) {d = 0}
+    var style = (jsMath.Browser.msieInlineBlockFix ? '' : 'overflow:visible;');
+    style += 'width:'+this.Em(w)+'; height:'+this.Em(h+d)+';';
+    if (jsMath.Browser.mozInlineBlockBug) {d = -h}
+    if (jsMath.Browser.msieInlineBlockFix) {d -= jsMath.d}
+    if (d) {style += ' vertical-align:'+this.Em(-d)+';'}
+    if (c) {style += ' background-color:'+c+';'}
+    var html = '<span class="blank" style="'+style+s+'"></span>';
+    return html;
+  }
+
+});
+
+jsMath.Add(jsMath.mList.prototype.Atomize,{
+  /*
+   *  Creates the box HTML
+   */
+  bbox: function (style,size,mitem,prev,mlist) {
+    var box; var w; var h; var d;
+    var nuc = mitem.nuc = jsMath.Box.Set(mitem.nuc,style,size).Remeasured();
+    if (box == null) {w = nuc.w; h = nuc.h; d = nuc.d} // values before super/subs-cript
+    var nuc = mitem.nuc; nuc.Styled(); var pad = mitem.pad;
+    if (pad) {w += 2*pad; h += pad; d += pad; nuc.w += pad}
+    if (jsMath.Browser.msieCenterBugFix) 
+      {nuc.html = '<span style="position:relative">'+nuc.html+'</span>'}
+    nuc.html = 
+      jsMath.HTML.BBox(w,h,d,mitem.color,mitem.style) +
+      jsMath.HTML.Spacer(pad-w) +
+      nuc.html;
+    nuc.Remeasured();
+    if (pad && nuc.w < w) {
+      nuc.html += jsMath.HTML.Spacer(w-nuc.w);
+      nuc.w = w;
+    }
+    nuc.h  = Math.max(nuc.h,h);  nuc.d  = Math.max(nuc.d,d);
+    nuc.bh = Math.max(nuc.bh,nuc.h); nuc.bd = Math.max(nuc.bd,nuc.d);
+    mitem.type = 'ord';
+    jsMath.mList.prototype.Atomize.SupSub(style,size,mitem);
+  }
+});
+
+jsMath.Package(jsMath.Parser,{
+  
+  macros: {bbox: 'BBox'},
+
+  /*
+   *  Implement \bbox[...]{...}
+   */
+  BBox: function (name) {
+    var extra = this.GetBrackets(this.cmd+name); if (this.error) return;
+    var arg = this.GetArgument(this.cmd+name); if (this.error) return;
+    var nuc = this.Process(arg); if (this.error) return;
+    var color; var pad = 0; var style = '';
+    if (extra != '') {
+      var parts = extra.split(/,/);
+      for (var i in parts) {
+        if (parts[i].match(/^\s*([-+]?(\.\d+|\d+(\.\d*)?))(pt|em|ex|mu|px)\s*$/))
+          {pad = this.ParseDimen(parts[i],'',0,1)}
+        else if (parts[i].match(/:/)) {style = parts[i]}
+        else {color = parts[i]}
+      }
+    }
+    var atom = {nuc: nuc, atom: 1, pad: pad, color: color, style: style};
+    this.mlist.Add(new jsMath.mItem('bbox',atom));
+  }
+});