Internet Connection Sharing - Two Wireless?

Hi folks, is it possible to share an internet connection completely wirelessly if I got a USB 802.11 adapter?
It looks like I can share from ethernet to Airport, but my problem is I don't have a ethernet connection - it is completely wireless.

The reason I'm asking is at my parents shore condo the building is wired for wi-fi but only one of us can be on it at a tie. We're given an account, the first time you log in, you are redirected to a login webpage you enter your account/password and from there you have full access.

If you have a local area network (two or more computers connected in a network) with one computer connected to the Internet it may be useful to make the connection accessible to the other computers on the network by installing a software program, that is, that will give the network's computers access by proxy, by redirecting data packets.
I dont know much about that, but i think you look the connection which is may be already configured on the PC equipped with Internet access. For example: Your computer (PC no.1) will play the role of server (proxy) whereas the other network computers (PC no. 2, 3 and 4, etc.).
If the IP address is 192.168.0.1 for PC no. 1 and the others will respectively take the IP addresses 192.168.0.2, 192.168.0.3, 192.168.0.4, etc. So, then you can connect your PC in a network.

Hope this Helps!

Heh, not really.

But I figured out a solution the Linksys WTR54GS I just ordered one off ebay. It should allow me to share a wireless internet connection.