If your mouse functions are limited, you might look at the USB Overdrive poop at
http://tinyurl.com/kvca6. I've used Overdrive for some time, and it enables the two buttons and the scroll wheel on my various mouses to do whatever I want them to do, both on a couple of iBooks and a new MacBook. The comments at the cited web site about Overdrive's ineffectuality with MacBook's Intel chip may apply to new downloads of this shareware, but when I firewired my old version of it from an iBook to a new MacBook, along with everything else on the iBook hard drive, Overdrive came up working just fine. Kagi asks $20 for the software, but once registered, it apparently tansfers to any other computers you have.
MacBook 1.83, iBook G4 & G3 Mac OS X (10.4.8)