Hi Brian,
If the pictures are 'in-line with text, you can break the links by selecting them and pressing Ctrl-Shift-F9. If you select all the pictures (eg hold down the shift key as you select them), you can break the links for all the selected pictures in one go. And, if there are no other fields in the document, Ctrl-A followed by Ctrl-Shift-F9 will do the whole document at once.
Cheers
macropod