function showVideo(quelle,video)
{
 var url = "tools/video.php?quelle=" + quelle + "&video=" + video;
 if (!(Videofenster))
 {
  var Videofenster = window.open(url, "Fenster1", "width=450,height=500,left=0,top=0,scrollbars=no,location=no,menubar=no,resizable=no");
 }
 else
 {
  Videofenster.location.href=url;
 }
 Videofenster.focus();
}