How do I trigger off camera flash?

How do I trigger off camera flash? I've got a Canon 20D and a 430EZ Speedlite. I'm trying to trigger the 430 w/ a cheapy optical slave and the on camera flash. Speedlite fires but camera doesn't pick it up. I'm assuming the camera flash is putting out an anti-redeye deal or something that's causing the Speedlite to fire before the lens opens. I've played w/ all the settings I can...

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