Can't Share Internet via Ethernet with Leopard

With Tiger I used to be able to share my Sprint USB Broadband connection with my Xbox 360, using a Airport Express which was connected through ethernet to the iMac. In Leopard it seems like their remove the internet sharing via ethernet option, which won't let my set up work. It lets me share internet comming from ethernet, but no the other way around. Any solutions?

Hi,
I need to better understand your set up connecting to the internet. Pls correct me if any of this is not true:
You have a USB modem connected to your iMac by USB cable
You have an Airport Express connected by Ethernet to your iMac
You want the iMac to pass the USB internet connection to Airport Express and have the XBox obtain internet from Airport Express?
In Tiger can you remember what you had selected for "Share your computer from"?

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