How can I get my wired LAN to share my iMac's wireless internet connection

Hi. (sorry for the long-winded posting below. I really struggled to explain what I'm trying to do, but would really appreciate any help from people who can recognise what I'm aiming for!)
I've seen several postings about sharing internet connection, but none (I think) which sort my problem.
I have a wired LAN with 3 Macs connected to a router, and the router to a cable modem and the internet. All working fine. All Macs have internet access.
I'm considering ditching my broadband provider, and so looking for a replacement configuration, at least for the short term.
So, I'd like to change the arrangement, connecting one of the Macs to the internet (through a local free WIFI hotspot) using it's airport card (that bit is done) and enable the other two Macs to share that connection via the router.
I've turned internet sharing on, and share connection from Built-In ethernet, on the internet connected Mac. But whatever
Has anyone got this setup working?
PB
Intel iMac 4,1 (early 2006)   Mac OS X (10.4.8)   1Gb SDRAM, 2GHz

You can share a connection through the router or you can share a connection from the Mac via Internet Sharing, but you can't share an already shared connection.

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