function showActiveSubMenu(){
	if(document.getElementById('activesubmenu')!=null){
		document.getElementById('activesubmenu').style.display='block';
	}
}
function maskActiveSubMenu(){
	if(document.getElementById('activesubmenu')!=null){
		document.getElementById('activesubmenu').style.display='none';
	}
}

startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
					if(this.className=="parentoff over")
						maskActiveSubMenu();
				 }
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}
window.onload=startList;