/*
function hide_select(){
	var select = document.getElementById("centro").getElementsByTagName("select");
	
	for (var i=0; i<select.length; i++) {
		if(select[i].style.visibility == "hidden")
		{
			select[i].style.visibility="visible"
		}else{
			select[i].style.visibility="hidden";
		}
	}
}
*/
navHover = function() {
	var lis = document.getElementById("menu_principal").getElementsByTagName("LI");
	for (var i=0; i<lis.length; i++) {
		lis[i].onmouseover=function() {
			this.className+=" iehover";
			/*hide_select();*/
		}
		lis[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
			/*hide_select();*/
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", navHover);
/*addLoadEvent(navHover);*/