کد جاوا :

<script>
 var isNS = (navigator.appName == "Netscape") ? 1 : 0;
  if(navigator.appName == "Netscape") document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
  function mischandler(){
   return false;
 }
  function mousehandler(e){
     var myevent = (isNS) ? e : event;
     var eventbutton = (isNS) ? myevent.which : myevent.button;
    if((eventbutton==2)||(eventbutton==3)) return false;
 }
 document.oncontextmenu = mischandler;
 document.onmousedown = mousehandler;
 document.onmouseup = mousehandler;
  </script>