Airport login issues

[Padudeman]

I'm using a Powerbook G4 at work, OSX.5.3 and I can't log on to the server using the airport. Ethernet works fine. The airport icon in the toolbar is gray but it does see 2 routers, an Apple express and a Belkyn. I think the problem could possibly be that these routers require a 'WPA2 Personal' password but this laptop doesn't have a WPA2 option. Is there a way to get WPA2 or do I need them to change password settings? Or could it be something else?
Thanks

 

[soberbrain]

I've got a 15" Aluminum Powerbook G4 with an 802.11g Airport Card that's connect to my Airport Express via WPA2.

Do you have an older Airport Card? I have read that 802.11b Airport Cards cannot access WPA2.