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You only need a cable which can be found for a couple of bucks and a Mac-VGA adapter.
http://cgi.ebay.com/MACINTOSH-POWERBOOK-VIDEO-CABLE-190-520-540-/300544133640?pt=LH_DefaultDomain_0&hash=item45f9d38a08
Though I'm pretty sure you can find one for even cheaper.
http://cgi.ebay.com/MACINTOSH-POWERBOOK-VIDEO-CABLE-190-520-540-/300544133640?pt=LH_DefaultDomain_0&hash=item45f9d38a08
Though I'm pretty sure you can find one for even cheaper.