function click (e) 
  {
  if (!e)
    {
    e = window.event;
    }
  if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) 
    {
    if (window.opera)
      {
      window.alert("Diese Funktion ist deaktiviert.");
      }
    return false;
    }
  }
if (document.layers)
  {
  document.captureEvents(Event.MOUSEDOWN);
  }
document.onmousedown = click;
document.oncontextmenu = click;