//Fenster Öffnen
function showPopup(sFile,w,h)
  {
    sFile = 'image.htm?'+sFile+'&'+w+'&'+h;
    vX =  screen.width / 2 - w / 2
    vY =  screen.height / 2 - h / 2
    wndPopup = window.open(sFile,null,"left="+vX+",top="+vY+",height="+h+",width="+w+",status=no,toolbar=no,menubar=no,location=no,scrollbars=no");
    wndPopup.focus()
  }