function SwitchMenu(obj) {
	if(document.getElementById) {
		var el = document.getElementById(obj);
		var ar = document.getElementById("frases_categorias").getElementsByTagName("span");
		if(el.style.display != "block") {
			for (var i=0; i<ar.length; i++) {
				if (ar[i].className=="submenu")
					ar[i].style.display = "none";
			}
			el.style.display = "block";
			document.cookie="desplegable=0";
		} else {
			el.style.display = "none";
			document.cookie="desplegable=1";
		}
	}
}