Bridging network cards

[nukes]

Right, I've had to clear out my room, and need some services that my computer normally provides. The only place I can put it is in a room with only 1 network point and a Win98 machine that has to use it. I was thinking I could just throw another network card in (RLT8029, uses the ne2k-pci driver) as well as my onboard SIS900 controller. Then bridge the connections to allow my bro access to the LAN from his machine.
I don't have the ability to set a monitor, mouse or keyboard, all I have to work with is SSH, which I enabled as a boot service before I packed up.
Here's the specs:
K7S5A mobo with cheepo bios & modded Chipset heatsink.
XP1700+@2000+ speeds
Gentoo Linux
2.6.0-test4 kernel
What steps do I need to take? This is pretty urgent, I have things that I need to get off the computer, and need to know what I'm doing before hand. If it makes any difference, the IP range is 192.168.0.x with the 98 machine being 12, and this one 13.
VMware also runs on it with bridged networking.

[Siliconjunkie]

Why not just use it for a NAT box? Should be seemless to him.

[strangerstill]

You need brctl, the user-space tool for configuring the (kernel-space) bridge.

bridge-utils package in RPM based distros.

This ldp page discusses bridging + netfilter. Looks like bridging is quite easy (assuming you compiled it into the kernel)

[nukes]

Why not just use it for a NAT box? Should be seemless to him.

The way the network, firewalls and server are set up require each user to have a different IP, I don't want to complicate things more than is needed, as this setup should only be in place for like 2 days at the longest.
strangerstill: That looks exactly like what I am looking for. Teaches me to be so lazy eh?
The reason for this is at the moment, I'm on a 2k machine using IE6. I don't like it at all, and want to keep the use to the minimum, plus its my dads box and I don't have much access to it.