remapping f key functions

Hi, I recently installed a new top case on my macbook (2.2 ghz 2008 model) and the keyboard is from an older model than that I believe. Everything works perfectly my only beef is that I no longer have Rewind, pause/play and fast forward on my F keys, and after 2 years of being used to that it's somewhat of an annoyance.

Is there any way I can remap the keys so they can function the way I had them with my older keyboard?

Thanks for any help you can give me, it's much appreciated.