<script language="JavaScript"> 
            var message="Right-mouse click is not allowed";
            function click(e)
            {
                if (document.all)
                {
                    if (event.button==2||event.button==3)
                    {
                        alert(message);
                        return false;
                    }
                }
                else
                {
                    if (e.button==2||e.button==3)
                    {
                        e.preventDefault();
                        e.stopPropagation();
                        alert(message);
                        return false;
                    }
                }
            }
            if (document.all) // for IE
            {
                document.onmousedown=click;
            }
            else // for other browsers
            {
                document.onclick=click;
            }
        </script>