How to set up a Stack LightBox:At first you need to put the StackLightBox Loader on top of your page. There you can set up a few attributes for the lightbox behaviour on this page.
You can set up invisible content using the "Stack LightBox". You need to give it a unique ID. Afterwards add a link to any content (outside the Stack LightBox!).
In the URL part insert the ID of the Stack LightBox you want to show.
Add a Custom Atribute and name it 'class' with value 'mb_lightbox'.
If you want to group it in order cycle through a gallery of lightboxed elements you have to add another attribute: 'rel'
All elements that should appear grouped need to have the same 'rel'-value, for example 'gallery1',...
If you don't add the rel attribute all non 'rel'-led elements will be grouped too, so if you want one lightbox to appear non-grouped you need to give it a unique 'rel'-value.