On the network but can't get online

I am a teacher on a school wireless network and I can’t seem to connect to the internet. My problem has baffled the tech guys here so I was hoping you might have a suggestion.
I have put the proper password and code in and my signal icon at the top says I am connected to the school wireless network but when I actually try and go online the web browser is blank and eventually times out.
Other laptops have no problem connecting and as far as I can tell, mine is set up exactly the same as theirs. Can anyone think of any reason for this or have any suggestion of how I could fix it?
Thanks

In case you are wondering what this TCP/IP business is. Getting connected requires two separate steps. The first is hooking up with a wireless router, which is equivalent to plugging in an ethernet cable; this is where the WEP password comes in. After that is done, though, your laptop still has to be set up to communicate properly with other computers on the network. Typically, this is done by something called DHCP that gives your laptop a temporary IP address for proper routing of data packet. Your IT spec should have told you how to configure iBook to do this; does he or she know anything about Macs? One would think that a school network would have plenty of Macs.

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