MacBook - Airport Problem???? Can't Connect to Internet

So, basically, I connected to my internet and was using my internet via my wireless router for a few months when all of a sudden, my airport shows me connected to my router; however, I can't open any internet pages. At first this was only occurring for my network and I was able to use my neighbors connection. However, soon enough, the same problem would occur with my neighbors connection so in short, I can connect to a wireless signal but I can't open any internet pages etc. Does anyone know what could possibly be the problem?

I have Verizon FIOS in case that is relevant.