You can always try getting past by translating the page from something like german to english, for that use
Altavista or
Google translation.
Ours at school is a pain in the ass, it has like a learning mode on it and if it finds you going on a certain site too many times it'll automatically block it. We've even tried using a different browser. It sucks, they block websites when they should be tackling people using P2P software to take advantage of the 5MB line.