function cierre(){
	document.getElementById('volver').innerHTML='<a href="javascript:this.close();"><img src="../imagenes/flecha_cerrar.gif" width="45" height="33" alt="Cerrar esta ventana" title="CERRAR" /></a>';
}
window.onload = function(){
	var dominio = /[congresosdelalengua]/i;
	var detectar = dominio.test(window.opener.location);
	if(detectar){cierre();}
}