lost my network connection, need help

Here's what I did, this morning half a sleep, I was attempting to disconnect an ipod from my computer. I somehow disconnected something else, and now cannot access the internet from my computer.

Here's how my "network" is set up.

Jason's computer is the main one that the modem (cable) and wireless router (linksys wrt54g) are connected to. My computer and the wireless printer are connected together. However, the printer is connnected to his computer thru the wireless. I cannot get on the internet thru my computer. It keeps telling me "Plug a cable into the network adapter-"Local Area Connection." I never unplugged anything physically.

Both computers have Vista, which I'm still not used to and am still learning. I have gotten on his computer and tried to go thru the set up of the router, and it tells me there is no connection. I am on his computer now, it does have an internet connection (I did not change how it is connected to the internet, but can still get on, on his computer, I can not get online with my computer, the laptop, and can not print from either computer with the printer.)

Any help would be greatly apprecitated before I completely lose my mind!

Thanks,
Jenn