Child value?

Basically what I'm trying to do is when a user selects a picture i
have a hidden input field of that picture name which will then be
stored in the database when they submit the form. The pictures are
list classes and I can get the list class selected however, I'm
stumped on how to get the hidden input value as i'm sure there is a
way to get it without writing multiple functions for each list item /
input (image1, image2 etc...)
Any ideas on how to do this?