From the sounds of it, Linux detects your hard-wired ethernet port, but needs a driver for the wireless card. In fact, Linux by default doesn't support very many wireless cards at all. You're usually forced to download the drivers.
So, you'll first need to find the exact name and model of your wireless card. Then google the brand/model of the card + "linux driver" or something similar. You'll then find a driver, and (hopefully) installation instructions.
Warning: many wireless drivers require you to compile them and need the kernel's source code. If you run into such a problem, come post here and we'll give you further instructions on that.
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