function popup(URL) {
  var width = 630;
  var height = 570;
  var left = 240;
  var top = 100;
  window.open(URL,'janela', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=yes, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no');
}