function a_gal(URL) {

  var width = 595;

  var height = 500;

  var left = 0;

  var top = 0;

  window.open(URL, 'Fotos', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=no, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no');

}