Using Airport Extreme Base Station As A Wireless Card?

Hi,
I don't know if this is even possible but here's what I'd like to do:
I've started to share an internet connection with a cousin of mine that lives in my apartment building. The connection is in her apartment and as far as I can tell the wireless signal is coming from the modem she has, there is no stand alone router/ base station. So far I've just been connecting using my iBook with the aiport card in it. No problems. I just had to get the ip number and password from her and I was hooked right up.
Here's my real question:
I also have a G4 Mini with no wireless card in it at all and an Airport Extreme base station from before we started sharing a connection. In the time that we've been sharing I haven't connected to the internet at all using the Mini. Now I'm wondering if there is a way I can hook the Airport Extreme to the Mini and somehow use it as a replacement for a wireless card in the Mini. Thus using the Mini connected to the Airport to connect just the Mini to the internet.
I'm not worried about the iBook and do not wish to reconfigure the way I'm using/ connecting with it. Everything is peachy with that.
If this is possible, how can I do it?
Thank you in advance for any help with this.

Ernest Lohrer wrote:
Hi,
I don't know if this is even possible but here's what I'd like to do:
I've started to share an internet connection with a cousin of mine that lives in my apartment building. The connection is in her apartment and as far as I can tell the wireless signal is coming from the modem she has, there is no stand alone router/ base station.
She has an "integrated" modem/router/access point.
So far I've just been connecting using my iBook with the aiport card in it. No problems. I just had to get the ip number and password from her and I was hooked right up.
Here's my real question:
I also have a G4 Mini with no wireless card in it at all and an Airport Extreme base station from before we started sharing a connection. In the time that we've been sharing I haven't connected to the internet at all using the Mini. Now I'm wondering if there is a way I can hook the Airport Extreme to the Mini and somehow use it as a replacement for a wireless card in the Mini. Thus using the Mini connected to the Airport to connect just the Mini to the internet.
I'm not worried about the iBook and do not wish to reconfigure the way I'm using/ connecting with it. Everything is peachy with that.
If this is possible, how can I do it?
Set up the AEBSn as a "bridge" and connect the G4 Mini to one of the "wired" internet connections.

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