Function Lock on OS X 10.6.8

[Xandaaa]

So I'm currently saving up money to build my PC and bought my keyboard first. I got the rosewill rk 9100 kb on sale and one thing I found annoying was that I had to hold the fn key when I wanted to toggle volume use multimedia keys etc. I did a little research and tried to lock my fn key. They told me to just go to system preferences and select the box that says Use all F1, F2, etc. keys as standard function keys. I went to look and couldn't find that checkbox, so i looked for alternatives. I found something called FunctionFlip, downloaded and extracted it only to find out that it didn't work on intel based PC's. so if any of you guys know how to help with this it would be greatly appreciated.