Check Which Mouse Button is clicked in IE Using java Script

   <script type="text/javascript" >

    document.onmousedown=fnMouseButton



    function fnMouseButton()

    {

        alert(event.button);

        switch (event.button)

        {

            case 1  : 

                alert('Left button clicked');

                break;

        case 4  : 

                alert('Middle button clicked');

                break;

        case 2  : 

                alert('Right button clicked');

                break;

        default : 

                alert('Unexpected code: ' + btnCode);

        }

    }



    </script>