var cambia = 1;
var ant = document.createElement("DIV");

function cambiar(menu){
	ant.style.visibility = "hidden";
	ant.style.display = "none";

	if(ant!=menu){cambia=1}
						
	if(cambia==1){
		menu.style.visibility = "visible";
		menu.style.display = "block";
		ant=menu;
		cambia = 0;
	}else{
		menu.style.visibility = "visible";
		menu.style.display = "block";
		ant=menu;
		cambia = 1;
	}
}

function cerrar(){
	ant.style.visibility = "hidden";
	ant.style.display = "none";
	cambia = 1;
}