I believe your computer shipped with a VGA adaptor. I know that my PB G4 did and it has the same assortment of ports on the outside as your iBook. You should be able to use this adaptor to connect to the projector. If you can't find yours, you can order a new one off of the apple store website. I am sure that my old iBook 700mhz shipped with one as well, now that I have thought on it for a while. But either way, you should be able to get a new one from the Apple store if you need it.