add Gallerybuilder.js and gallerybuilder.css to your project. buildCaptions needs an dictionaty as parameter. An empty one, {}, for default values displaying dates in Gallery and Lightbox/Modal. Or eg ...

If a small thumbnail is to be displayed first and a higher-resolution photo is to be loaded into the lightbox, the data-src attribute is added. UPDATED: If the gallery in the lightbox is to run ...