Linksys routers and Macbook pro

I'm having trouble getting my macbook pro to recognize my linksys router WRT54gs. A pc is currently plugged into the router and is connecting to the internet easily. I can't get my airport card to recognize the network. I've searched the other messages and have followed some of the suggestions as to how to set up airport, but I've still not managed to get anything to work. Any help would be appreciated...but keep it simple, guys...newbie here!!