Add dynamically footer image to a adobe form

Hello,

I need some advises how to add dynamically footer image to the adobe form.

Example: Purchase order will be created by 3 different plants -  PL01, PL02 and PL03.

Depends on the plant I need to have different footer image (plant address).

Can you please describe where to store my images, how to link adresses to image boxes in the form and how to switch depends on the plant (e.g. Formcalc).

Thanks,

Evgenij