Wireless Connection Problems... [Help!]

Hey guys,
On my laptop, I have Wireless and LAN connections. At one point, I switched from Wireless to LAN for a day or so. But now, when I connect to my wireless connection, it says I’m connected, and I’m sure it is. But the thing is I’m not connected to the internet, when I really am. I don’t understand what happened. Does anyone have any ideas?