function obrazek(src, sirka, vyska)
{
  if (sirka < 440)
  {
    sirka = 440;
  }
  sirka += 22;
  vyska += 180;
  s = ((sirka < screen.width) ? sirka : (screen.width - 40));
  v = ((vyska < screen.height) ? vyska : (screen.height - 60));

  volby = 'width=' + s + ',height=' + v +',resizable=yes';

  window.open(src, 'okno', volby);
}