// Control de las ventanas
function abreVentana(url){
    var ancho=0;
    var alto=0;
    if (window.screen){
      ancho = ((screen.width - 550)/2)-70;
      alto = ((screen.height - 480)/2)+70;
    }
open(url,"VentanaAuxiliar","toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,scrollbars=yes,width=550,height=350,top="+ancho+",left="+alto+"");

return
}
function abreVentana2(url){
  var ancho=0;
    var alto=0;
    if (window.screen){
      ancho = ((screen.width - 750)/2)-20;
      alto = ((screen.height - 575)/2)+0;
    }
open(url,"VentanaAuxiliar","toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,scrollbars=yes,width=750,height=575,top="+ancho+",left="+alto+"");

}