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diff --git a/jsMath/extensions/underset-overset.js b/jsMath/extensions/underset-overset.js
new file mode 100644
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+++ b/jsMath/extensions/underset-overset.js
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+/*
+ *  extensions/underset-overset.js
+ *  
+ *  Part of the jsMath package for mathematics on the web.
+ *
+ *  This file implements \underset and \overset macros.  It will be loaded
+ *  automatically when needed, or can be loaded by
+ *  
+ *    jsMath.Extension.Require('underset-overset');
+ *  
+ *  ---------------------------------------------------------------------
+ *
+ *  Copyright 200-20065 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.Package(jsMath.Parser,{
+
+  macros: {
+    overset:  'Overset',
+    underset: 'Underset'
+  },
+  
+  Overset: function (name) {
+    var top = this.ProcessArg(this.cmd+name); if (this.error) return;
+    var bot = this.ProcessArg(this.cmd+name); if (this.error) return;
+    var op = jsMath.mItem.Atom('op',bot);
+    op.limits = 1; op.sup = top;
+    this.mlist.Add(op);
+  },
+
+  Underset: function (name) {
+    var bot = this.ProcessArg(this.cmd+name); if (this.error) return;
+    var top = this.ProcessArg(this.cmd+name); if (this.error) return;
+    var op = jsMath.mItem.Atom('op',top);
+    op.limits = 1; op.sub = bot;
+    this.mlist.Add(op);
+  }
+
+});