Cry for help!

Oi... all you web-savvy peoples out there... got an important question for my web portfolio. We're trying to get the links work so that when you click on a link, that link will turn a different color (the hover color, white) Unfortunately, it is not letting us do that, no matter what code we are putting in. I'm not that great with the coding, so if anyone out there can help with it, I'd great appreciate it!

Webpage here:

http://cc.usu.edu/~pathack