NAME
        OffMenu -- disable the given menu or menu item.

    SYNOPSIS
        OffMenu( window, menunumber )
                 A0      D0

        VOID OffMenu( struct window *, uword );

    FUNCTION
        This command disables a sub-item, an item, or a whole menu.
        This depends on the contents of the data packed into MenuNumber,
        which is described in the Intuition Reference Manual.

    INPUTS
        window = pointer to the window
        MenuNumber = the menu piece to be disabled

    RESULT
        None

    BUGS

    SEE ALSO
        onmenu(), resetmenustrip()