dropdown = function() {
if (document.all && document.getElementById) {
navRoot = document.getElementById("dropdown");
for (j=0; j<navRoot.childNodes.length; j++) {
node = navRoot.childNodes[j];
if (node.nodeName=="li") {
node.onmouseover=function() {
this.className+="highlight";
  }
  node.onmouseout=function() {
  this.className=this.className.replace("highlight","");
     }
    }
   }
  }
}
window.onload=dropdown;