Can't create a computer to computer network

Hi,
I have a 1.8Ghz iMac G5 and my partner recent bought a iBook 12". The iBook came with built in airport and so I puchased a airport extreme card for the iMac so we could wirelessly connect the two computers.
The iMac has 10.3.9 and the iBook has 10.4.3.
I've tried everything I can think of but I can't seem to get the computers to see each other. I've created a network on either machine but can't see it on the other.
My thoughts are that there must be a fault with one of the cards, any other ideas?
Thanks
Olivier

Rather than create a computer to computer wireless network it can be easier to use one of the Macs as software base station instead and allow the other Mac to connect to this Mac created wireless network.
On the iMac
System Preferences > Sharing > Internet Tab
Share internet from (anything) via Airport
Your iBook should be able to connect to this iMac created wireless network.
iFelix

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