function click(e) {
   if (document.all)
   {
     if (event.button==2) {
       oncontextmenu='return false';
      }
   }
   if (document.layers) 
   {
     if (e.which == 3) {
      oncontextmenu='return false';
     }
   }
}
if (document.layers) {
document.captureEvents(Event.MOUSEDOWN);
}
document.onmousedown=click;
document.oncontextmenu = new Function("return false;")