Macbook No Internet Connection - full bar on airport

having this problem today.
cannot get Internet connection to work. in safari it will load a page or two but wont load anymore.
The airport icon in the menubar shows full signal strength all the time.
The following messages appear in safari:
You are not connected to the Internet
Safari can’t connect to the server.
I've tried using the network diagnostics utility but that provide any clues. said it was a network problem.
tried restarting mac three times, turning airport off, erasing network in system preferences and rejoining.
Internet is working via Ethernet cable. never had a problem before like this.
have two other macbooks and on windows that are working perfect on same network.
help appreciated,
david

Well I have tried many of the sugestions without much improvement. I can say that sometimes it works for a while then it just slows or stops. Some have said it has to do with how Safari 4 handles web pages. If for instance their is a problem with hte Flash portion of a page Safari 4 will ignore that portion and not crash. It will load the rest of the page. But that does not explain why Firefox has the same issue. It still directs me to Snow leopard or possible a recent update to Airport that happen last month I believe that was applied to Leopard too. Whatever it is I have resorted to using Windows machine because it does not freeze up on my network.

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