OK here's my situation..., I NEED HELP!!! Options

[Nick novalis]

OK so I wanna get online with PSOGC... I need sum advice!

OK, lets sort everything out by sorting out what I have:
A GameCube
An iMac running OS 9.2 using an external USB ADSL modem
The iMac has all the usual iMac ports (2xUSB, 2xFireWire, Ethernet, Modem)
BTBroadband as my ADSL ISP

Coming soon (obviously) a copy of PSO Ep. I & II

Now I need some help and advice as how to get my GC online!
My first choice is to get it online using my broadband connection, so I know Ill need a BBA and an Ethernet Crossover cable.
But what next? I can't connect the BBA directly to my modem, as it has no Ethernet port... but my computer has...
This is making my head hurt! Will it work if i use my iMac's Ethernet port? Or is there no chance of it working simply because I am using an Apple?
How do i get it working from there?

[Nick novalis]

Yeah I know, the whole subject confuses me -.-
As a last resort Ill just get a GC modem and use pay-per-minute dial-up..

As a last-but-one resort Ill have to buy an Ethernet-compatible ADSL modem...


Oh and i know it is possible to use a USB modem through the computer, as there is a guide to doing it... on a Windows-running PC -.-;;