The next step is to show multiple images in one lightbox. If we just add a couple more
<a href="..." title="..." class="bblb"> to the document, every link would have its own lightbox. So the user would have to open and close the lightbox for every link.
If we group the images they will be available in one lightbox and the user can slide between the elements.
To group some elements you have to set the "data-bblb-group