activateMenu = function(nav) {
if (document.all && document.getElementById(nav).currentStyle) {  
var navroot = document.getElementById(nav);
var lis=navroot.getElementsByTagName("LI");  
for (i=0; i<lis.length; i++) {
if(lis[i].lastChild.tagName=="UL"){
lis[i].onmouseover=function() {	
this.lastChild.style.display="block";
}
lis[i].onmouseout=function() {
this.lastChild.style.display="none";
}}}}}
window.onload= function(){activateMenu('menu')}