Safari Not Connecting to Internet?

So I just moved into a friends basement and they have a NetGear Router. Yesterday the interent worked fine on my computer. Today after fiddling with my Airport Express, to get it hooked up to their Bose Speaker system. I had it working as a relay fine. Every computer in the house connected fine and I had used Safari fine. Then about an hour later I went to send an email and it wouldn't connect to the server. I opened Safari and it too couldn't connect to the web. I then checked the network status and it said everything was just fine and that I was connected to the internet through Airport. I fiddled with updating the router's firmware and resetting evrything several times in the correct order. Now I got the internet working through FireFox, but not through Safari. Crazy, huh? What could it possibly be, I really would hate to do a clean install for the such a little thing. Mail is sort of working, it can access my gmail but not send emails?

Thank you both, I changed the location from Automatic to Home and it works fine now. It's funny how I weeded through all kinds of advanced settings and managed to miss this simple one. This is why I love MR, it's fast, free, and better then calling tech support (most of the time).