function iniciar_menu () {

	raizMenu = document.getElementById("barraMenu");
		
	for (i=0; i<raizMenu.childNodes.length; i++) {
		nodoMenu = raizMenu.childNodes[i];
		if (nodoMenu.nodeName.toLowerCase()=="li") {
			nodoMenu.onmouseover=function() {
				this.className += " over";
			}
			nodoMenu.onmouseout=function() {
				this.className = "";
			}
		}
	}
}