Internet sharing ad hoc

Hi,
I have an iMac G5 and a recently MacBook. I want to connect together by wifi(ad-hoc).
iMac receives internet connection from ethernet and shares it by Airport.
I choose as password(WEP) 10 digits and now I can connect, but I havent got internet access in MacBook yet. This is my set up:
iMac´s Airport IP: 192.168.1.1
iMac´s Gateway: 192.168.1.1
MacBook's IP: 192.168.1.2
MacBook's Gateway: 192.168.1.1
But I cannot ping from one computer to another one.
Any ideas ?

Oops! it was my fault.
I was setting in the iMac: Sharing connection from Airport and I have to choose ethernet
Now works perfect, Macbook is on network now
Gracias Ned

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