Debian Cannot Access Internet Despite Being "Connected"

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http://unix.stackexchange.com – I'm have a problem, I cannot access the internet. I'm using a dell inspiron 6400 with debian kernel 3.2 installed. My windows manager is xfce4. I was never able to figure out the wired network, however at my home I had the wireless network working just fine. I'm at my mom's house now, and I can't get the wireless to connect. I connected with wicd, and it says that I'm connected, however I can't access the internet(seems very strange). I have a CS assignment due before I get home, so I need to figure this out very quickly. Is there anything I can do to determine my connectivity? Thanks for th (HowTos)