From lspci, it does not appear that you have a wireless card, at least not on the PCI bus. Some of the L3800 do, I found this link, it's in German, you will see the wireless card in lspci on that system.
http://home.arcor.de/hirnstrom/linux...n_laptops.html
The easy way to add it is to buy a PCMCIA card, and plug it in. If you go that route, investigate the chip set first. I have an older Thinkpad, and wound up buying two cards, before I found one with native linux support. The stores don't have a clew what they are selling, asking there is almost pointless. I'm using a D-link DWL-G630. It has native support, I also have a D-link DWL-650+, it would only work with Ndiswrapper and the windoze driver.
You do have an ethernet card, so you can plug hardwire it, until you get a card.