Generic, Multi-Purpose Mouse Driver?

I recently got what seems to be an off-brand mouse for my laptop. 10 bucks. Works like a charm.

The only irritation is that it has three extra buttons and doesn’t have any drivers for it whatsoever (I asked the seller). They said it’s strictly plug’n play.

I was wondering if anyone knew of any generic drivers that might be able to help me out with assigning functions to these extra buttons?