function mousedown()

    {

       return false;

    }

    function mouseup(e)

    {

        if(e != null && e.type == "mouseup")

        {

            if (e.which==2||e.which==3)

            {

                    return false;

            }

        }

    }

    function contextMenu()

    {

        return false;

    }

   

    if (document.layers)

    {

        document.captureEvents(Event.MOUSEDOWN);

        document.onmousedown=mousedown;       

    }

    else

    {

        document.onmouseup=mouseup;

    }

    document.oncontextmenu=contextMenu;