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;