// as thumbnail <img src="thumbnailer.php?img=images/completedProjects/68coronet-01.jpg&w=108&h=81" alt="" /> // original file <img src="images/completedProjects/68coronet-01.jpg" alt="" />
<a href="images/completedProjects/68coronet-01.jpg" class="lightbox"><img src="thumbnailer.php?img=images/completedProjects/68coronet-01.jpg&w=108&h=81" alt="" /></a>
here

Re: help with image dialog
the preview is using the "data-cke-saved-src" attribute, not the "src" attribute.
And the attribute needs to be edited in the "onShow" section.
Now to auto create the link element. . .