PC laptop connects to Imac's airport network, but can't browse internet

Hi there,
I've got a new early 2008 iMac with inbuilt Airport and I'm trying to use the in-built airport to create a wireless network with my windows based PC laptop.
Before getting the iMac this year I had an old 2000 eMac and a Netgear router that I used to connect my PC to the internet wirelessly. It worked perfectly after I set it all up using the Router login page.
But now using the in-built Airport, the PC can go as far as connecting to the iMac's internet connection, but whenever I try to view a page on Firefox or IE, I get an "address not found" page. And yes, I've got my Firefox's network connection settings set to "auto-detect proxy settings for this network".
Is there something wrong with my Airport, or are there some fundamental setup steps I need to go through in setting up the network?
This is what I did to set up my Airport network: I chose Create Network from the Airport pulldown menu, then gave it a name, with the channel set to Automatic (11). I've chosen a 5 ascii character WEP password. Then when I connect on my PC laptop for the first time, it sees the SSID, then asks for the network key. I enter it, it spends about 3 minutes trying connect to the iMac, and finally it says Connected, with a signal strength of excellent.
This is all well and good, but as I said, as soon as I try to access the internet, it fails with a broken page. Even though it says "connected" as the wireless status.
The same happens when I set up a new network using this time a 13 ascii character WEP password.
Is it in fact possible to connect to the in-built Airport using a PC, or do I need to get a new external router. Seems a bit of a waste...
Any help much appreciated!
Lachlan

Hi Duane, thanks for your reply.
I did as you said. I opened Sharing preferences, selected share your connection from Ethernet to computers using Airport. I then set up a new network with new WEP password, but unfortunately my PC won't connect at all to it. After I hit the connect button, it tries for a while, then I get the message "Windows is unable to connect to the selected network..."
Is it because I've said to connect to computers using Airport? Only one computer's got airport and that is the iMac that I'm trying to connect the PC to.
A reply above says I still need a router - is that the case? I thought the iMac's built in Airport effectively acts as a router.
Thanks again for your help.

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Message was edited by: kukumuzu
if relevant, my software versions are as follows:
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I don't know if this is a help forum but I'm trying several places to see if I can fix my issues.
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Message was edited by: scooter

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