sfHover = function() {	
 navRoot = document.getElementById("menu");
 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", "");
   }
  }
 }
}

if(window.attachEvent) {
 window.attachEvent("onload", sfHover);
}