function popup($url, $win, $w, $h, $opcje) 

 {
  if (!$opcje)
    $opcje = 'toolbar=no,location=no,directories=no,status=no,menubar=yes,resizable=yes,copyhistory=no,scrollbars=yes,';
  l = (screen.width - $w)/2; 
  t = (screen.height - $h)/2; 
  nw=window.open($url, 
              $win, 
              $opcje + 
              'width=' + $w + 
              ',height=' + $h + ',' +
              'top=' + t + ',left=' + l);
  nw.moveTo(l, t);
  nw.focus();
}