var isNS = (navigator.appName == "Netscape") ? 1 : 0;
  if(navigator.appName == "Netscape") document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
  function mischandler(){
//alert("Do Not Use Mouse Right Button!");
   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;