startList = function() {
   if (document.all&&document.getElementById) {
       navRoot = document.getElementById("nav");
       for (i=0; i<navRoot.childNodes.length; i++) {
           node = navRoot.childNodes[i];
           if (node.nodeName=="LI") {
               node.onmouseover=function() {
                   this.className+=" over";
               }
               node.onmouseout=function() {
                   this.className=this.className.replace(" over", "");
               }
           }
       }
   }
}
window.onload=startList;