Add Supported Channels Airport extreme Macbook Pro 15' late 2010

My wireless network at school recently added another router under our classroom. The channel for this connection is channel 13 which is not supported under the default supported channel settings.
I was wondering if there is way to add or change these settings.
Thank you,
Danny Dagan
p.s. We are having this problem only with 4 MBP's late 2010 although we have 3 iMac 24's that DO CONNECT TO channel 13.

Hi Bob,
Thank you for the reply. One thing I forgot to mention is that I am in Israel. I didn't think this would be an issue! Anyway, during this week I was able to find out a little more information about this problem.
Our wifi network at school is "shared" by two routers. The first is in one building about 300 meters away and it is using channel 5, and the second is in our music studio and it is using channel 13. We asked our network administrator at school to either change the name of the second router in our studio or to just change the channel to 1-11. He said that just because we have macs he will not go through the trouble(hater). The iMacs we use in our classroom were bought here in israel, so I am assuming that this is the reason they have channel thirteen and everyone who bought a mac book pro in America does not have channel 13.
ANYWAY!!
Definately an annoying problem that can be solved in a minuet, but because of some very lazy people it might take a little more effort. Thank you once again for the help, I really appreciate it.
Thank you,
Danny Dagan

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