rclick_message="Context menu disabled";

function rclick_IE(e) 
{
     if (navigator.appName == "Microsoft Internet Explorer" && (event.button == "2" || event.button == "3"))
     {
          alert(rclick_message);
          return false;
     }
}
function rclick_NS(e) 
{
     if (document.layers || (document.getElementById && !document.all))
     {
          if (e.which == "2" || e.which == "3")
          {
               alert(rclick_message);
               return false;
          }
     }
}
document.onmousedown=rclick_IE;document.onmouseup=rclick_NS;document.oncontextmenu=new Function("return false");