brightness/contrast controls on iMac CRT?

[Martin-Éric Racine <q-funk@pp.fishpool.fi>]

Greetings,

Is there any package that would allow me to control those settings, so that the
monitor doesn't burn itself to death by staying on fullbright all the time?

This is on an iMac Rev.D 333MHz.

Thanks!
-- 
Martin-Éric Racine
http://www.pp.fishpool.fi/~q-funk/