Sharing a 3G usb modem on the iMac via Airport Express

Hi,
I would like to be able to share my 3G/HSDPA USB Modem that is currently connected to my iMac over the Airport Express wireless network at home. The objective is to let every computer (PC and Mac) connected to the wireless network (Airport Express) to be able to access the internet via the iMac 3G/HSDPA connection.
I could have shared the 3G connection directly via the Internet Sharing, but this would require the computers to switch wireless network.
Can anybody describe on how to achieve this?
Regards,
Hindra

Finally, after several tries with the guidance of Duane's posts on how to set it up, I got this to work.
Objective: To be able to share a 3G wireless connection connected to an iMac using 3G USB Modem with the rest of the network connected via wireless Airport Express.
{Internet} <---> 3G USB Modem <---> iMac <---> Airport Express <---> Other computers (PC and Mac)
1. Set the Airport Express to Join a Wirelss Network, and name the network to be the same name as the name of the network set in the Internet Sharing (on the iMac)
2. Set the Internet Sharing on the iMac, and share the 3G USB Modem network name to the Airport network and name the Airport network to be the same as No. 1
3. That's it....
Big Thanks to Duane for your help.
Regards,
Hindra

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