noweOknoPopup = null;
function list_popup(src, w, h, tytul){
  if(window.screen){
    aw=screen.availWidth;
    ah=screen.availHeight;
  }else{
    aw=640;
    ah=450;
  }
  if (noweOknoPopup!=null&&(!noweOknoPopup.closed))
  {
  	noweOknoPopup.window.close();
  }
  if(noweOknoPopup==null || noweOknoPopup.closed)
  {
    ustawienia=
     "left=" + (aw-w)/2 + ","
    +"top=" + (ah-h)/2 + ","
    +"screenX=" + (aw-w)/2 + ","
    +"screenY=" + (ah-h)/2 + ","
    +"width=" + w + ","
    +"height=" + h + ","
    +"innerWidth=" + w + ","
    +"innerHeight=" + h + ","
    +"toolbar=no,"
    +"location=no,"
    +"directories=no,"
    +"status=no,"
    +"menubar=no,"
    +"scrollbars=yes,"
    +"resizable=yes"
    noweOknoPopup = window.open('','obrazek',ustawienia);
  }
  noweOknoPopup.document.location=src
  noweOknoPopup.focus();
}