a year old iBook to connect with a wireless network

I have a question regarding iBook and wireless. I'm getting a wireless network in my flat, I have a new Powerbook G4 with Airport, but one of my other flatmates have got a year old iBook without Airport-technology. What is the alternatives to connect to the wireless-network? buy external Airport-card?

hope to get a response, thanks....

yup, hed need an airport card in his ibook, not external, its internal, hed put it in. and that would be about it, as long as you have an airport extreme base station or wireless router.

o, and if you set that up, make sure you use wep, and require a password so only you two can have access.

thanks a bunch, macman, that was exactly what I needed to know.