var popup_ids = new Array("menu_ul", "popup_div");
          var popup_tags = new Array("LI", "DIV");

          startList = function() {
              if (document.all&&document.getElementById) {
                  for (idx_ids = 0; idx_ids < popup_ids.length; idx_ids++) {
                    navRoot = document.getElementById(popup_ids[idx_ids]);
                    for (i=0; i<navRoot.childNodes.length; i++) {
                        node = navRoot.childNodes[i];
                        for (idx_tags = 0; idx_tags < popup_tags.length; idx_tags++) {
                            if (node.nodeName==popup_tags[idx_tags]) {
                                node.onmouseover=function() {
                                   this.className+=" over";
                                }
                                node.onmouseout=function() {
                                   this.className=this.className.replace(" over", "");
                                }
                            }
                        }
                    }
                 }
              }
          }
          window.onload=startList;