i just got a rocketfish bluetooth adapter for my powermacg5 and a apple wireless bluetooth keyboard from best buy. i had no trouble setting it up. accept the f7(previous/rewind) f8(play/pause), f9(fast forward), f10(mute), f11(lower volume) and f12(higher volume) dont work right. ive tried setting them up in system preferences but nothing seems to work. anyone please help??