Creditos = null;
Mapa = null;

function ver_creditos(url){
	if(Creditos && !Creditos.closed){
		Creditos.close();
	}
	if(Mapa && !Mapa.closed){
		Mapa.close();
	}
	Creditos = window.open(url,"CreditosWin","width=200,height=200");
	Creditos.focus();
}