var isNS = (navigator.appName == "Netscape") ? 1 : 0;
var EnableRightClick = 0;
if (isNS) document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);

function mischandler(){
  if (EnableRightClick==1) return true;
  else return false;
}
function mousehandler(e){
  if (EnableRightClick==1) return true;
  var myevent = (isNS) ? e : event;
  var eventbutton = (isNS) ? myevent.which : myevent.button;
  if ((eventbutton==2)||(eventbutton==3)) return false;
}
function keyhandler(e) {
  var myevent = (isNS) ? e : window.event;
  if (myevent.keyCode==96) EnableRightClick = 1;
  return;
}

document.oncontextmenu = mischandler;
document.onkeypress = keyhandler;
document.onmousedown = mousehandler;
document.onmouseup = mousehandler;