Hi,
I am little lost here.
Our Product Slider Effect doesn't come with a popup lightbox extension at all, looks like this is what you have implemented by custom coding. Am i correct?
Normally, as you see in the DEMO:
www.flexiblewebdesign.com/virtuemart-2-template-fashionmart/index.php?option=com_content&view=article&id=72&Itemid=491
Once the product picture is clicked, they go to product details page directly, this is what happens now in your website. The popup lightbox doesn't open, because it isn't supposed to.
Mootools FIX is fixing the commonly faced jQuery-MooTools Conflict error. Since currently i don't see any JavaScript error in your website, looks like it fixes the conflict errors in your website as well. So keep it "active".
Since lightbox functionality doesn't come with our Slider module and our slider wasn't designed to work okay with lightbox, i can't guide to achieve what you are looking for. By the way, lightbox or other popup plugins usually get activated/triggered once a proper class="" or rel="" attributes are defined.
For instance;
<a class="lightbox".... >...</a>
or
<a rel="lightbox" ....>...</a>
will trigger the lightbox plugins and lightbox will start working then for that link. Our Product Slider doesn't come any of those attributes beside the <a href=""> has defined as product details page, not the product full picture. How possible you active the lightbox plugin for the product full pictures? Most likely with custom coding, and this brings the same result: "we don't provide support for custom coding", once the module works and functions exactly as same as you see in our DEMO, our support ends there.
Regards.
Support & Development