-Heart Break Kid
And let me guess, you have file sharing capability, but no Internet right?
Network my friend!
Sure, you have good WiFi connect, but you need to after that, hit your network control in your System Preferences and see what you have.
In order to use the web, you need an IP address that will tunnel within your wireless connection. Find out from the school administrator what kind of internet gateway they are running (DHCP, static, or other) for the doling out of IP addresses.
Pain, but necessary.
Oh, and once you figgure it out, save the Network profile so you can go from networt to network without having to write all of them down.