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('nav');
}