Can I connect my iBook via Airport/Ethernet to share internet?

I have a G5 iSight connected via Airport to the internet. I want to connect my G3 iBook via Ethernet to the G5 and connect to the web. When I opened Sharing on the G5 and started sharing my connection, it warned me that doing so might cause problems. And it was right. I lost the internet connection to the G5 and had to reboot the modem.
Before I rebooted, I opened up Network on the iBook and saw that Ethernet had an active internet address of something like 196.168.... with a "3" on the end -- the same sort of number as my G5 is assigned except that it has a "1" on the end (I think).
Is it possible to share my G5's internet connection with my iBook? How?

Thanks for the response, Camelot. It is still no go. This is what I did. For the G5:
1. +Network > Airport+ (under TCP/IP) gives the IP address as 192.168.1.1, and the router as 192.168.1.254.
2. In +Network > Built in Ethernet > TCP/IP+ I selected manually (for configure IPv4), then typed in 10.0.0.1 and the sub mask you suggested. The router I left blank.
3. I applied the above.
4. Under Sharing, I selected +Share your connection from: Airport+; +To computers using: built in Ethernet+.
5. When I selected Start I got the warning: +If your computer is connected to a network, turning on Internet sharing may affect the network settings of other computers and disrupt the network. Contact your system administrator before turning on Internet sharing.+
6. I booted the iBook (OSX 10.3.9) and opened Network preferences to see what happened when I connected the Ethernet cable. Under +Network Status+ I saw Ethernet come up with a yellow button (and a message), and then a green button with the message: +Ethernet is currently active and has the IP address 192.168.2.3. You are connected to the internet via built in Ethernet.+
7. When I checked +Built in Ethernet > TCP/IP+ on the iBook it was set to DHCP.
8. The iBook would not connect to the internet, but the G5 would. At least that's an improvement.
Seems a curly one to me.

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