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;