function presentar(galeria)	{
	var ops = "status=no,width=600,height=680,top=" + (screen.height / 2 - 340).toString();
	ops += ",left=" + ((screen.width / 2) - 300).toString();
	diapo = window.open("proyector.php?galeria=" + galeria, "_ventana", ops);
	diapo.focus();
}