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('vertnav'); 
}