Multiple images, one record

Multiple images, one record

I have a form that is used to capture the following info:

-Facility Name
-Origin
-Shipment #
-Picture of Damaged Pallet (Image field)

I want to be able to capture multiple pictures without having to create a new record, as there might be multiple damaged pallets on the shipment. Obviously, one never knows how many damaged pallets might be on a shipment so I'd prefer not to create 20 image fields and have most of them unused.  I'd prefer that they have an option to add another image only if they need it.  

Any ideas?