Internet connection cuts in and out, only on iMac 2.8 Duo, not MacBook Pro

Problem started 2 weeks ago
Only on my new iMac, my internet connection disappears randomly, without any problem at the same time on the laptop or iPhone, and with no loss of Airport function/connection, only the internet and mail access is lost, and only on the iMac. I tried changing location, no help. Reboot the Airport, no help. I ran the newest Disk Warrior and did other checks on my system, and it all checks out OK. It's easy to think that things do help at first, b/c the connection comes and goes, seemingly at random.
I found a temporary, reliable fix - open Network diagnostics and just go thru the dialogue boxes. The first window always shows green lights for Airport, Airport Settings, Network Settings, and ISP, but "Internet - failed" and "Server - failed" and by the time I go thru each window, it's fixed, and the outbox empties and Safari opens the page. The problem is, then, an hour later or so, it's all lost again.
Please help!

Just to clear this up so there's no confusion, there are two different things called Airport Extreme. The physical external hardware - wireless router, and then there's the internal wireless card inside the iMac, which is also an Airport Extreme card (you'll see this if you go to "about this mac" and select the hardware button - wireless card). I do not have the Airport Extreme external wireless router. I'm using a Motorola SBG900, and others have had this problem with D-link wireless routers. The recent software update for Airport Extreme has messed with the settings of the internal wireless card. If I go to Airport Utilities, it's looking for the external Airport Extreme router's settings. When you configure yours, are you configuring the external router, or the internal card's settings? My Airport Utilities stays blank when I open it (assuming this is because I use a 3rd party wireless router). Can you confirm that you're using the Apple Airport Extreme wireless router?

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I know this topic has been covered before and there is a support page for this problem on the apple website but I haven't been able to fix the problem using either hence the post so sorry for repetition.
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