Display light dims after about 30 sec

No matter what I try, working with battery power or not, using the auto-brightness function or not, after about 30 sec my screen dims when I'm not touching any keys and/ or don't move the mouse....extremely annoying while reading a long article or watching pictures !!!!
is there anyway to disable this terrible automatic function?
It has nothing to do with auto-brightness, I turned that off in the system preferences option, but it hasn't changed anything.
My screensaver is set to start after 10 min, so that has nothing to do with it either.....
Thks for feedback
Macbook Pro 17" 2 G RAM 100 G 7200 rpm   Mac OS X (10.4.8)  

I go into my Energy Saver preferences under "Options" and check "Automatically reduce the brightness of the display before display sleep." Then I uncheck it right away and it's fine until I reboot. Them I have to do it again.
http://docs.info.apple.com/article.html?artnum=304092
-Bmer
Mac Owners Support Group
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