assigning volume control on F keys

[TuckerdogAVL]

Checked old forum threads and couldn't find this. I'd like to assign F keys so I can adjust volume up or down. Any suggestions on how to do this? I can't figure out where the "volume application" (I know there probably isn't one, but what is it?) would be. I have a non-standard keyboard. (I just purchased a new Microsoft egonomic and have to take it back. The egonomic is okay (I already use one by adesso) but I have to hammer the space bar. Otherwise, the keyboard was modifiable though with lots of good stuff to keep the carpal tunnel down. But, I can't deal with the banging needed to put spaces between words). If anyone has any ideas about any other ego keyboards out there that are mac friendly, let me know. This one is okay, but not the greatest. (I do like the fact though that it has the mac standard keys ie control, alt, etc) vs the stupid Microsoft "Start" become to close things.