Went to check a few things...
If there is a wireless adapter there you can set up a static IP address with a line like
ifconfig eth0 192.168.0.2 255.255.255.0
I just tried that on my onboard network adapter (which I don't use much) and it worked OK. It threw up some kind of error/warning... but it did it! I'm not sure about using DHCP, as I never do.
If you have got to here I think the only thing you'll need to do is set the WEP key (if you are using one). I think it should just auto detect what type of key (64/128) from the parameter you pass to it, and it should detect the frequency to operate at as well.
iwconfig eth0 key *WEP_KEY* [KEY_ID_THING]
The other thing you'll probably need to do is set the default gateway (router address), somewhere, but off the top of my head I can't remember where.
you should have a poke about in seemingly network related config files/scripts like