Must have wireless! Help!

So I went to the Oakside Cafe for breakfast/lunch, because they advertise free wireless. And indeed, there is a wireless network here. A strong one.

But my laptop won't access it, and I don't know why.

I set network and internet connect to airport, but it still didn't work. I'm going to try to reboot it now. I'm using the iMac they have in the lounge, but I can't send resumes from it because it doesn't have my resume on it. :(

There's a sheet that says
SSID: oakside
Mode: infrastructure
WEP: off

I know what the first and third are, but what is the second? Anyone have any idea how to get this to work?