I'm trying to get 2 recently acquired machines online and can't seem to figure out how. Here are the facts and some possible pertinent information. Hopefully someone can help me out... I have 2 400Mhz Powermac G4s without wireless cards. I have no access to a physical ethernet line. I do, however, have 2 unused airport express base stations. Can someone either point me to a place where I can purchase a wireless card for the machines (my understanding is the Airport Extreme card sold at the Apple store these days will not be compatible?) or point me to instructions on how to use my airport expresses to get online (if thats even possible)? Thanks!!