I installed the new Mac OS system Lion and now safari says not connected to the internet?

We have upgraded our OS for the $29.99 from apple. Now when we try to open safari it says its not connected to the internet while on wifi. At the top however it is. Then you click on the diagnostics button in the middle of the "can't connect" screen in safari and it finds the address again... Then after a series of opening and closing safari and then opening my email and forcing it to get email... Then the safari browser does work... Please help. This is really annoying.

Thanks,

Jason