XP and Windows 98 - Network Gaming Help

HELP!!!

My son wanted to connect his playstation 2 to his computer in his bedroom
which is Windows 98 (2nd edition). The internet works fine via a Speedtouch
121g adaptor and my main computer (Windows XP), downstairs (which has a
Speedtouch 585 router).

Playstation have been little help when I phoned, on the playstation forum I
was advised that I need to create a network bridge on my son's computer
(Windows 98) but I don't know how to do this. I have looked and looked but
can't find HOW to do this.

Can anyone help with this bridging matter or give me any better advice.

From buying him the Playstation2 network adaptor (for his Birthday back in
March!!!), I have bought the router + wireless usb adaptor, a crossover
cable, ethernet card (as his computer didn't have a ethernet port), and we
still haven't managed to get the internet working on the playstation, though
it is fine on his computer.

Please, Please, Help!!!
--
Diane