Internet Sharing and Airport Express

[bcemail]

For a while I've had an Airport Express (AX) across the room from my mini, with my printer and stereo hooked up to it (called "My Network"). I recently got a Powerbook, and set up a network (called "My Mac Mini")with internet sharing on, and was able to use it to surf online, etc. Then I went to print something from my mini and realized that I had two different networks, which I didn't intentionally do, but both of them took a lot of work to get working right. Can I combine them? Is it possible to have my mini networked with my AX and at the same time sharing it's internet connection with other wireless devices? Or do I have to get a router, hook it up to my AX and expand my network?

Thanks for the help!