An experiment with custom code

My aim is to build a custom lightbox that pulls caption data from the alt tags set for images uploaded into a multi-image field of a CMS gallery.

For example, If I want to add multiple images to a blog post, I can add a multi-image field and then upload many images. From here, I want to use custom code to display the alt tags like they were a caption.

This method is explained by PixelGeek here.