Microsoft intellimouse 4th and 5th button assignment

Okay, so I have a Microsoft Intellimouse optical mouse, and in Windows, pressing the 4th and 5th buttons would go back and forward in explorer/internet browsers, respectively. However, they don't seem to do anything at all in OS X. Can I assign them to do the same things as in Windows?

 

Thanks! The driver from Apple's website does exactly what I want it to.

EDIT: Unfortunately, middle clicking now goes into expo mode.... I'll look into fixing it, but some help would be appreciated
EDIT1: Nevermind, i just reassigned the middle button to be handled by Mac OS