function abreVentana(url)
{
	ancho = 380;
	alto = 450;
	scro = "no";
	h=(parseInt(window.screen.height)/2)-(parseInt(alto)/2);
	v=(parseInt(window.screen.width)/2)-(parseInt(ancho)/2);

	window.open(url,'','scrollbars=' +scro+ ',toolbar=no,directories=no,menubar=no,status=no,location=no,width='+ancho+',height='+alto+',top='+ h +',left='+ v);

}