document.onmousedown = disable_right_click;
function disable_right_click (e)
{
	  which=(document.all)?event.button:e.which
	  if ( which == 2 || which == 3 )
		   {
		   window.returnValue=false;
		   it=true
		   return  false ;
		   }
	  return  true ;
 }
document.oncontextmenu = function() {return false;};
document.onselectstart = function() {return false;};