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I use Lightbox2 like thumbnail - > original image on node.
When user want to view original image, I would like to require Login.
This mean, guest user can see the thumbnail, but cannot view Original image.
I checked the permission area, but lightbox2 may donot have such permission checkbox.
How can I require login when I guest user click the original image(this mean, when they use Lightbox2, require login)