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Image Swapping with Custom Code

So, I’m trying to create a custom lightbox modal. I have a main center piece image and tiny thumbnails. I just want to swap out the image source when the thumbnails are clicked. However, I can’t figure out why this is not running? Any ideas?

var lightboxImage = '';
$('.photo-strip-item').on('click', function(){
  lightboxImage = $(this).find('img').attr('src');
  $('.lightbox-image').attr('src', lightboxImage);


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