Ibook lost from network

I have an:
-Airport Extreme (802.11n)
-Airport Express (modem)
Until recently I had my:
-Ibook G4 (OSX 10.3)
-Imac G5 (OSX 10.4)
-Mac Mini (OSX 10.4)
all on my network and connecting to the internet. After messing with the settings I've managed to get everything back except for the Ibook which can't connect to the network nor therefore the internet.
I have both the stations set up:
-channel 1
-n (b/g compatible)
-WPA/WPA2 Personal 128
Airport utlity is kept at v7.2 to include the Express base station.
ANY SUGGESTIONS??

Thanks so much for responding, Tesserax.
My hub is a "Linksys 5-Port Workgroup Hub," model EW5HUB.
The cable modem is plugged into the port called "Uplink." The Mini is plugged into port 1, the eMac into port 2, and the Airport into port 3.
The network has functioned properly in the past (the iBook used the printer plugged into the Mini, and we shared files back and forth). Recently, I had to reset the Airport, but I thought I had reconfigured it correctly. In short, Airport configuration would be my main suspect here.
I'm afraid I don't know what (if anything) is supplying NAT service. I assumed it was something the Airport does -- allowing it to sort out the flow of data to the various computers. The question is beyond my expertise level because I don't really understand what NAT service is. Is the problem in my Airport's Network configuration?
My ISP assigns IP addresses dynamically, so my Airport doesn't have a static IP address. However, my ISP allows for only two IP addresses, so I need my ethernet computers to also share the Airport's address.
I hope that, somewhere during my ramblings, a light has gone off in your more enlightened mind. Thanks again for your help!

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