My question is concerning the F keys (F1-F12). I recently installed Leopard and to activate Spaces it said to use the F8 key. It somehow doesnt work. To activate spaces I have to use Funtion F8. It seems to be like this for the other F keys as well. For example: F10 which is used to view all application windows currently open can only be activated on my computer using Function F10. When I press these keys(F8 and F10) they control the keyboard illumination like it is engraved on them. Pretty much the main idea is that I have to push the fn key down to activate any of the actions that I used to just use the F keys for alone. 
Thanks a lot for all the help.
Thanks a lot for all the help.