function right(e)
{
  if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2))
  return false;
  else if (navigator.appName == 'Microsoft Internet Explorer' &&  (event.button == 2 || event.button == 3))
    {
    alert("Vielen Dank für Ihre IP-Adresse ...");
    return false;
    }
  return true;
}
document.onmousedown=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
window.onmousedown=right;