Create a .bat command prompt by opening notepad and typing in command. Save it as whatever name you want and save it as a .bat. Double click it and ping the website you want to go to. Open IE and type in the IP you got. Voila.
[Edit] You may not be able to make the notepad command prompt on your school computers, do it at home and then save it on a drive or email it to yourself and put it on the computer at school.
me school is gay, we got grants from bill gates, so he sent us a bunch of dell computers straight out of the microsoft factory with every block imaginable and then gave our district microsoft I.T. to run the network :<