We just covered this post about connecting a laptop without a network card to a network, it has most (if not all) the info you'd need.
http://www.daniweb.com/forums/post637159.html#post637159
The short of it is that the easiest way is to pick up a network adapter (Cardbus or USB) you can get them off ebay for a few $$$ and install without any serious tech experience.
Failing that you can use specialized USB cables (kind of hard to find and more expensive than a networking adapter) firewire (probably not on a laptop that doesn't have ethernet) or a serial "null modem connection" to another computer that is connected to the network.
OlyComputers
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