XP Pro Laptop - wireless @home, SBS2003 @ work

I have a laptop with XP Pro that, at home, connects to a wireless network
for internet access. At work we have a server running SBS2003. I'd like to
use my laptop at work and go through the network for internet access. I do
NOT need to access any files on the server or network.. just get internet
access.

I know very little about networking. Can someone recommend a site where I
can start learning how to do this?
I don't know how the laptop is configured for the wireless connection at
home.. it just worked when the wireless router was plugged into the cable
modem.
I also am not sure about the configuration of connection sharing through the
server so I need to learn what to check before I can even ask for help here.

Thanks in advance
Boze