function Open_Popup(SCRIPT_DIR, URL, WIDTH, HEIGHT)
{
  fullurl = SCRIPT_DIR + "anzeigen.php?file=" + URL + "&width=" + WIDTH + "&height=" + HEIGHT;
  windowproperties = "width=" + (WIDTH + 20) + ",height=" + (HEIGHT + 20) + ",scrollbars=no";
  window.open(fullurl, "newwin", windowproperties);
}