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;