You can do that with a field coded as:
{IF{=MOD({PAGE},2)}= 1 {QUOTE 12}}
Simply insert the field code before the final paragraph break. You might also need to ensure Word's option to 'automatically update fields before printing' is checked. To get the pagination to update, you'll need to do something like updating all fields (e.g. via Ctrl-A, F9), a Print Preview, or printing the document.

Note: The field brace pairs (i.e. '{ }') for the above example are all created in the document itself, via Ctrl-F9 (Cmd-F9 on a Mac); you can't simply type them or copy & paste them from this message. Nor is it practicable to add them via any of the standard Word dialogues. The spaces represented in the field construction are all required.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]