if (window.Event)
  document.captureEvents(Event.MOUSEUP);

function nocontextmenu()
{
   event.cancelBubble = true
   event.returnValue = false;
   return false;
}
function norightclick(e)
{
   if (window.Event)
   {
      if (e.which == 2 || e.which == 3)
         return false;
   }
   else
      if (event.button == 2 || event.button == 3)
      {
         event.cancelBubble = true
         event.returnValue = false;
         return false;
      }
}
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;