Connecting my MacBook to an LCD projector

I'm an ESL teacher, and my kids made simple movies of themselves telling stories, using my secondhand MacBook and Photo Booth. When I tried to connect to my LCD projector, using the dongle that came with my G3, it wouldn't fit! Our librarian said I need a different one (grrr) for the Macbook, but when I went online to search, it appears that I need a different device altogether - some kind of Mini DP Display port.
Does someone know what I really need? Thanks!
Helen

Does someone know what I really need?
In the short term what you need is to post this in the right forum. You posted this in the Panther and earlier OS forum but your computer information says you're using Leopard, but that doesn't matter because this is really a hardware problem and would best be off in the forum for your computer. I'll ask it be moved there.

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