startList = function() {
  if (document.getElementById) {

    navRoot = document.getElementById("topNav");
    if (navRoot) {
      for (i=0; i<navRoot.childNodes.length; i++) {
        node = navRoot.childNodes[i];
        if (node.nodeName.toUpperCase()=="DIV") {
          node.onmouseover=function() {this.className+=" over";}
          node.onmouseout=function() {this.className=this.className.replace(" over", "");}
        }
      }
    }
    
  }
}
startList();