I have the older Power Mac G4 (without FireWire 800) and have a wireless G router. Since I have the older Mac, I cannot use an Airport Extreme card, but I want to be able to use 802.11g technology, preferably with the Airport Extreme. Is there an Airport to Airport Extreme adapter, or any other way to use the Airport Extreme card? If not, what is a good 802.11g card that is Mac compatible?