Setup AExpress to share internet w/ iMac (internal Airport)

Thw iMac in house is sharing internet through on board airport: "House Computer" over Network Fastaccess DSL/Airport connection. Home office is in backyard and signal is weak so I bought a Airport Express.
When I run iMac's Airport Utility it sees the new Airport Express but doesn't recognize the onboard wireless signal so I can configure the AEx?? If I try to walk through the utility for the new device it won't let me?? Also it makes me turn off the internet sharing of the iMac.
The Airport Express is new (5/2010) the iMac is 2 years old and on OS 10.4...
Help

Hello Rae Nell Hunter. Welcome to the Apple Discussions!
Sorry, but you cannot use the AirPort Express Base Station (AX) to extend the wireless range of the built-in AIrPort Extreme Card in your iMac.

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