2003-04-09  Mark McLoughlin  <mark@skynet.ie>

        Update the sensitivity of the image/color configuration
        widgets as appropriate to the selected background type.
        Fixes #107609.

        * panel-properties-dialog.c:
        (panel_properties_dialog_upd_sensitivity): impl. making
        the color/image configuration widgets insentive as
        appropriate.
        (panel_properties_dialog_background_toggled),
        (panel_properties_dialog_setup_background_radios),
        (panel_properties_dialog_update_background_type): use it.
        Also remove all references to the transparency radio
        button. It doesn't exist anymore.

        * panel-properties-dialog.glade: name the containers of
        the image/color widgets sensibly so we can get a handle
        to them.