NTL Broadband over Airport

I have an NTL Broadband connection here in the UK.

It is connected via Ethernet into my iMac, and it works fine.

I have now installed an Airport Card into the iMac and my iBook and I would like to share the Internet connection across the two.

I am running OS X 10.2, so I have turned on Internet Sharing via Airport on the iMac and it is now acting as an Airport Base Station.

I can see the Airport Network from the iBook and I am able to connect to it fine.

The problem is I am not getting access to the Internet on the iBook.

If I use IE, is says 'looking for www.macnn.com' and then I get the 'server could not be found' message.

Here are the settings from the iMac Network Pane :-

Configure Using DHCP
IP Address : 213.106.132.119
Subnet Mask : 255.255.255.0
Router : 213.106.132.1

On the iBook the setting are as follows :-

Configure Using DHCP
IP Address : 10.0.2.2
Subnet Mask : 255.255.255.0
Router : 10.0.2.1

Can anyone help me please, or am I unable to share NTL's Broadband ?

I do know that if I want to connect my iBook to the NTL box via the Ethernet cable, I need to reboot the NTL box and the iBook. In fact I needed to register both machines with the NTL box before I could use them. But I assumed I would be sharing the connection from the iMac and it would not affect the NTL box. Please tell me I have not wasted �170 on two Airport Cards !!

Thanks in advance

Ian