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)
         {
            window.event.cancelBubble = true;
            window.event.returnValue = false;
            return false;
         };
      };
   };
};

document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;