I'm connected to my airport network but can't get online

2 days ago, i was online and everything was working fine.
Yesterday, i tried going online and i was told that i was not connected to the internet even though i had full signal bars from my airport. I've restarted my computer a dozen times, checked all my internet connection settings, but nothing worked, i'm still being told that i'm not connected to the internet although internet connect says i am. contrarily, network diagnostics says i am not connected.
this happened to me once before over the summer. i gave up and didn't use my computer for about a week. when i tried using it again, the internet was just fine. however, i do not have the luxury of waiting a week because my school curriculum requires the use of the internet.
what's wrong with my computer and how is it that i connected just fine 2 days ago, but cannot since then? please help!
Message was edited by: kukumuzu
if relevant, my software versions are as follows:
Safari 3.1.1
Internet Connect 1.4.3
Network Diagnostics 1.0.2

You might want to update Safari to 3.12. I would empty the safari cache. (Safari>Empty Cache). Then quit Safari. System Preferences>Network>Show:Airport>TCP/IP. Insert the following into the DNS Servers box;
208.67.222.222
208.67.220.220
then hit apply. Now launch Safari. You should also try powering down modem, router and Mac and power up in 2 minute sequence; modem, router, Mac.

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