Alternate Account Connection Configurations?

Hey guys, heres the deal.

-At home pidgin works fine for me, even though I'm behind a router (yay).
-At school, I have to change all the connection ports to 80 to avoid being blocked.
-At work, I have to change all my connection ports back to their defaults, because for some reason nothing connects otherwise. (I logged into the router at work and they have no settings for filtering, port forwarding, dmz, or anything at all actually)

I'm ok with this situation since it works and I can't seem to figure out what the problem is. The only thing is its kind of a pain to go into each of my accounts (aim, yahoo, myspace) and change each port individually. It would be nice if I could have per-location connection settings. Like by selecting, "At Home" or "At Work", all the ports would be set to their defaults, or by selecting "At School", all the ports go to port 80.

Or maybe theres a way to override this in the global network settings window?

I dunno. Anyone have any ideas?