var message = 'It is not possible to right-click. ';
 var ie = document.all;
 var n4 = document.layers;
 var n6 = document.getElementByld && !ie;
 function myHandler(ev)
  {
    if (ie && (event.button==2))
      {alert(message);return false;}
    if ((n6) && ev.button==2)
      {alert(message);}
  }
 if(n4) document.captureEvents(Event.MOUSEDOWN);
 document.onmousedown = myHandler;
 document.onmouseup   = myHandler;