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diff --git a/jsMath/extensions/fbox.js b/jsMath/extensions/fbox.js
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+++ b/jsMath/extensions/fbox.js
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+/*
+ *  extensions/fbox.js
+ *  
+ *  Part of the jsMath package for mathematics on the web.
+ *
+ *  This file implements the \fbox macro.  It will be loaded
+ *  automatically when needed, or can be loaded by
+ *  
+ *    jsMath.Extension.Require('fbox');
+ *
+ *  ---------------------------------------------------------------------
+ *
+ *  Copyright 2005-2006 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 frame
+   */
+  Frame: function (x,y,w,h,c,pos) {
+
+    h -= 2/jsMath.em; // use 2 pixels to compensate for border size
+    w -= 2/jsMath.em;
+    y -= 1/jsMath.em;
+    if (!c) {c = ''} else {c = ' '+c};
+    if (pos) {pos = 'absolute;'} else
+             {pos = 'relative; margin-right: '+this.Em(-(w+2/jsMath.em))+'; '}
+    return '<img src="'+jsMath.blank+'" style="position:' + pos
+             + 'vertical-align: '+this.Em(y)+'; left: '+this.Em(x)+'; '
+             + 'width:' +this.Em(w*jsMath.Browser.imgScale)+'; '
+             + 'height:'+this.Em(h*jsMath.Browser.imgScale)+'; '
+             + 'border: 1px solid'+c+';" />';
+  }
+
+});
+
+jsMath.Package(jsMath.Parser,{
+  
+  macros: {fbox: 'FBox'},
+  
+  /*
+   *  Implement \fbox{...}
+   */
+  FBox: function (name) {
+    var text = this.GetArgument(this.cmd+name); if (this.error) return;
+    var arg = jsMath.Box.InternalMath(text,this.mlist.data.size);
+    var f = 0.25 * jsMath.sizes[this.mlist.data.size]/100;
+    var box = jsMath.Box.Set(arg,this.mlist.data.style,this.mlist.data.size,1).Remeasured();
+    var frame = jsMath.HTML.Frame(-f,-box.d-f,box.w+2*f,box.h+box.d+2*f);
+    box.html = frame + box.html + jsMath.HTML.Spacer(f);
+    box.h += f; box.d += f; box.w +=2*f; box.x += f;
+    box.bh = Math.max(box.bh,box.h); box.bd = Math.max(box.bd,box.d);
+    this.mlist.Add(jsMath.mItem.Atom('ord',box));
+  }
+  
+});