Not a stupid question but we do need a bit more information. What kind of projector have you got? What kind of inputs does it have? Do you have a video processor or an HTPC?
A quick and easy answer is to run the cable into a VCR and run the VCR's composite output into the projector's composite input (pretty much every projector has a composite input). This is by no means the best solution, but if you provide more information on your setup, you'll get some more ideas.
A quick and easy answer is to run the cable into a VCR and run the VCR's composite output into the projector's composite input (pretty much every projector has a composite input). This is by no means the best solution, but if you provide more information on your setup, you'll get some more ideas.