Airport Express setup for Internet

Question

Alright, I just want to make sure this cannot be done, as the documentation with Airport Express isn't clear to me.
My setup is this:
- Wireless Model (D-Link from Comcast)
- 1 desktop hardwired (XP)
- 1 Laptop hardwired (Vista)
- All 3 above are in the Office in front of the house
I connected my Airport Express in an outlet in the living room, in the back of the house close to the back patio. No ethernet cable connected to it, just the Audio/RCA cable, that goes into my receiver. 2 outdoor speakers connected to the receiver.
I use my iPhone to connect to iTunes on my laptop, to play music outside.
So my iPhone sees 2 wireless networks:
- Comcast
- Airport Express
From outside, the signal for the Comcast (D-Link is almost unreachable, because it's too far. So I use the Airport Express, which is perfect. Problem is that I can't access the Internet with it.
Now, is there a way to configure the Airport Express so I can access the internet, without connecting an Ethernet cable to it?
The Airport Express is too far to have an Ethernet cable attached to it...

Answer 1

Guys, the Express is too far to have an Ethernet from the main base to the Express connected (unless I run a cable through the wall, etc...) but close enough that they see each other.
The only problem is that my iPhone can barely see the main base from my backyard, but the signal is much stronger when connecting to the Express.
Again, I cannot access the internet that way because it doesn't have DNS.
So you're saying that if I set it to "join an exisiting network", then I would only see 1 network with my iPhone and still get a good signal from my Express when in my back yard?
Or will I still have to choose which network to connect to?
Rememebr, right now, my iPhone can see 2 networks (Comcast and Airport Express).