var startList = function() 
{
if (document.all&&document.getElementById) {
  navRoot = document.getElementById("mynav");
    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;