If the computers you use in school are connected to main hub / server computer ..if the Admin at the school is good you will never get past it..unless you can get into the main server which is probly passworded so think you gonna have a tough time with this bud ;-)

I would not recomend trying to get past it seeing as how you need the admins password which i dought you will be able to obtain and if you obtain it with out permission you can get in some big trouble. but if you are desperate to get into trouble then go on google and search for pr0xys when you find one that your admins have not blocked just type the requested url into the adress line on the page and it should unblock it.but be warned that they watch the usages of these "pr0xy" websites and they will block any of them that are used with in 1 week so they do not last very long. another solution is to wait till you get home instead of risking getting banned from the schools computers or worse.