function startMenu() {
 if (document.getElementById) {
   nav = document.getElementById('theme');
   for (i=0; i<nav.childNodes.length; i++) {
     node = nav.childNodes[i];
     if (node.nodeName == 'LI') {
       node.onmouseover = function() {
         this.className = 'over';
       }
       node.onmouseout = function() {
         this.className = '';
       }
     }
   }
 }
}