function quitar(num){
	var imagen = document.getElementById("imagen"+num);
	var frame = document.getElementById("encima"+num);

	imagen.style.visibility = "hidden";
	frame.style.visibility = "visible";
}

function poner(num,img){
	var imagen = document.getElementById("imagen"+num);
	var frame = document.getElementById("encima"+num);
	
	imagen.style.visibility = "visible";
	frame.style.visibility = "hidden";
	
}