In what way would deleting one image 'modify' another's number? If you're using captions, they renumber automatically in response to inserting another one or deleting an existing one; it's just that the numbering update isn't dynamic - you need to do something to cause the field display to update (e.g. Ctrl-A, F9).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]