Can I configure mouse buttons on a Microsoft mouse?

I got the Microsoft bluetooth notebook mouse 5000, and it has one button that is supposed to go "back" a page while browsing. I never use this, so I'd like to know if I could make it bring up dashboard or some other useful thing. Is this possible?

Nevermind - in case anybody wanted to know, simply go to System preferences -> exposé and spaces -> under "dashboard", the second drop-down list will have "Mouse button 4"