How to configure screen-brightness of macbook to lowest value as default

Hi,
setup: macbook 3,1 with external 24" display. Basicly the user is only using the external screen which is defined as main screen in this 10.5 installation.
question is:
Is it possible to define the screen brightness of the macbook itself to lowest possible value ?
As the macbook screen is not used at all it would be great to disable the brightness or at least reduce it as much as possible. I can do that with the brightness-key, but that is only a session setting. not permanent.
any ideas ?
best regards
fidel

solved it with an applescript.

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