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() {	
                   if(this.className!='selected')
                   	this.lastChild.style.display="block";	 
                }
                lis[i].onmouseout=function() {         
                   if(this.className!='selected')
	                   this.lastChild.style.display="none";
                }
            }
        }
    }
}

window.onload= function(){
    activateMenu('nav');
}