Problem with function/F-keys

As of last night, the volume/brightness/etc. keys on my 15.4" macbook pro won't change the volume/brightness/etc. without pressing and holding the function (fn) key at the same time. How can I change my system back to volume and brightness and such being the primary functions of these keys? It's obnoxious having to hit the fn key every time I want to increase or decrease the volume on my system.
Thanks for your help!
MBP 15.4"   Mac OS X (10.4.6)  

As of last night, the volume/brightness/etc. keys on
my 15.4" macbook pro won't change the
volume/brightness/etc. without pressing and holding
the function (fn) key at the same time. How can I
change my system back to volume and brightness and
such being the primary functions of these keys? It's
obnoxious having to hit the fn key every time I want
to increase or decrease the volume on my system.
things to try:
first, go to your System Preferences and select "Keyboard and Mouse." Click the "Keyboard" tab and make sure that the checkbox labeled "Use the F1-F12 keys to control software features" is unchecked.
then try resetting your PRAM.
http://docs.info.apple.com/article.html?artnum=2238
after resetting your PRAM, you will need to reset other preferences stored there (time zone, display settings, etc)...
http://docs.info.apple.com/article.html?artnum=86194
post back if none of this helps... cheers

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