function mostrar(id, idimg)
{
	var estado = document.getElementById(id).style.display;	
	if(estado == "block")
	{
		document.getElementById(id).style.display = "none";
		document.getElementById(idimg).src = "./images/play.gif";
	}
	else
	{
		document.getElementById(id).style.display = "block";		
		document.getElementById(idimg).src = "./images/unplay.gif";
	}
}