Seamlessly switching network profiles

[Reuben D. Budiardja]

Hello,

My laptop (Dell Inspiron 4150) has Fedora Core 6. I carry it around to school, 
lab, and home. All these places have different network profile, eg:
School: Wireless, with SSID, or wired
Lab: Wireless, no ESSID
Home: Wireless, with SSID & WEP, or wired 
All uses DHCP to get IP.

I want to be able to somehow set it up so that I can move to anyone of those 
places, turn it on, and have internet connection. Also, If I have wire 
connected to the LAN port, I want for to use that instead of wireless (since 
it's faster connection). But also I want to be able to unplug the wire 
without rebooting and have it move to wireless connection.

Any help on how to do this ? 

Thank you.
RDB
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Reuben D. Budiardja