function active_menu() {//Acivar submenus
	var lis = document.getElementById("site_menu").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("iehover", "");
		}
	}
}