If you create a template with that image on the first page, every new document based on that template will inherit the image. For existing documents, the simplest way, too, would be for you to create a template with that image on the first page, then use a macro to propagate that first page to your other documents. But that raises the question of how those other documents would be recognised (e.g. all documents in a given folder).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]