Can't access Internet via Ethernet port of 'n' Express in 'Extend' mode

I just purchased the new Airport Express (AXp) n version for the purpose of extending my Airport Extreme (AXt) n version wireless network so that I can connect my old MacBook Pro (MBP) 17" core duo, running Mac OS X 10.5.2, to the AXp via an Ethernet cable when the MBP is stationary at my desk, in order to increase the maximum speed at which I am able to access the internet, from 54 Mbps for my MBP's internal wireless g card to 130 Mbps at which the AXp runs in the following configuration.
On the AXt, I set the wireless mode to create a wireless network, checked off the option to allow this network to be extended, set the radio mode to n (b/g compatible), set the channel to 11 (works best for our house), and set the wireless security to WPA/WPA2 Personal. On the AXp, I set the wireless mode to extend a wireless network, unchecked the option to allow wireless clients (I have also tried this option checked, as well), and set the wireless security to WPA/WPA2 Personal. Both Airport bases are running firmware version 7.3.1.
When I do this everything looks fine. My network preferences indicate that I have a valid IP address, and I am able to see and screen share with other computers on the local network; however, when I try to access the internet using Safari 3.1, I get a timeout error message indicating that the server I addressed is not responding. Then when I run the diagnostics from the network preferences, it indicates that my internet connection appears to be working correctly, and all the network status lights show green.
Any ideas?

Thanks so much for all your replies. I will try to address all the points in this reply.
99, I think you are right, about Apple not supporting using the Ethernet WAN port as a LAN port when the AXp is in the "Extend" mode. However, I had read on the Apple website that it does support using the AXp WAN as a LAN in the WDS "Remote" mode, as you have verified with your older AXp, and which I had also verified with my new AXp. The only problem was, when using the AXp in the WDS "Remote" mode, the AXp ran ONLY at 54 Mbps, even when there were no additional wireless clients connected to it or to the AXt, which kind of defeated the purpose of using the AXp as an Ethernet bridge in the first place.
The only way I could get an AXp bridge to run at 130 Mbps was to use it in the "Extend" mode or the "Join" mode. In the "Join" mode, using the WAN as a LAN works fine when connecting to the Internet, but I am not able to see or screen share with any of the computers on my local network. In the "Extend" mode, I am able to see and screen share with all the computers on my local network, but I am not able to get to the Internet, even though the Network Diagnostic tool reports that my Internet connection "appears" to be working properly, and it gives me all green lights (and as near as I can tell with my limited knowledge of DNS, all that information appears correct, as well).
Bottom line, I don't think Apple has properly enabled the AXp's WAN as a LAN in the "Extend" mode, as they have in the "Join" mode and in the slower WDS "Remote" mode.

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