oMenu = document.getElementById("menu");
for ( i=0; i < oMenu.childNodes.length; i++) {
   node = oMenu.childNodes[i];
   if ( (node.nodeName == 'LI') ) {
       if ( (node.getElementsByTagName('UL')).length > 0 ) {
         node.onclick = function() {   if (this.className != 'open') {  this.className = 'open'; } else { this.className = ''; } };
         aHrefs = node.getElementsByTagName('a');
         aHrefs[0].onclick = function () { return false; }; // cancel click for first link because it's menu ;
       }
   }
}