//function sottomenu(num_button) {
//	nome_layer = "Layer_" + num_button;
//	a = document.getElementById(nome_layer);
//	if (a.style.visibility == "hidden") {
//		a.style.visibility="visible";
//	} else {
//		a.style.visibility="hidden";
//	}
//	
//}

navHover = function() {
	var lis = document.getElementById("navmenu").getElementsByTagName("LI");
	for (var i=0; i<lis.length; i++) {
		lis[i].onmouseover=function() {
			this.className+=" iehover";
		}
		lis[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", navHover);