T39 + GPRS + orange + DLINK Bluetooth dongle + iBook + MacOS X = ??

I gather that you're a linux geek so maybe you haven't tried setting things up in this configuration, but if you have, and have managed to get it working, could you give me some clues ;)

I've got to the stage where phone & laptop can see each other, but am wondering how/where I get hold of a GPRS modem script for OS X and the T39, and what I need to fill in to the various configuration boxes. Do I need a GPRS enabled ISP? Will this entail even more expense?

Answers on a postcard...