How do I set this up? I want to plug my Airport Express into my Airport Extreme with Ethernet and have them both emit the same wireless network. Is that possible? I've been able to figure out how to do it without plugging it in with ethernet, but that seems kind of pointless, here's why: 1. My Extreme is on the South wing of my house. 2. I have low reception on the North wing of my house, where my room is. 3. I use AirTunes in my room, so I want my Express in my room. 4. If the only way to do it is how I have it now (set it to "join a wireless network"), then I might as well just connect to the Extreme wirelessly myself, because I get a poor signal and slow connection. My house is really big. Is there a way to do this? Or at the very least have to wireless networks, airport north and south, and have them both be able to talk to eachother as if they are one LAN?