if (document.layers)
   {
   window.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP)
   window.onmousedown=rightclick;
   window.onmouseup=rightclick;

   function rightclick(e)
   {
     if (e.which == 3)
     {
     alert("\n             Copyright" +
           "\n  " +            
           "\n        Graupner Immobilien");
     return false;
     }
     else
     {
     return true;
     }
   }
}

if (document.all)
   {
   function click()
   {
   if (event.button==2)
     {
     alert("\n Geschützter Bereich");
     }

    if (event.button==3)
       {
       alert("\n             Copyright" +
           "\n  " +            
           "\n        Graupner Immobilien");
        }
    }
    document.onmousedown=click
}