How can I program my mouse to utilize browser functions?

I’m running windows 7, FireFox and have a mouse that has multiple buttons on it. (SteelSeries WoW MMO gaming mouse)

Running windows vista, I’m able to utilize the buttons on my mouse to go back and forth in my browser (works the same as pressing the forward and back buttons.) I did not do anything special to accomplish this, simply installed the software that came with the mouse and stumbled upon this utmost of conveniences. But now that I’ve installed windows 7, it doesn’t work anymore.

I have reinstalled the driver for the mouse in compatibility mode and it still doesn’t work. This is really frustrating for me because it seems like it would be a simple to find a solution, but because of the vagueness in terms connected to the problem I wind up getting a lot of unrelated results in my searches and have not been able to find any helpful information.

Any ideals?