1) It is not working on cell phones, check my site www.solstisbust.com from a phone (I only checked iOS) and click on any image of the gallery.
2) How to make the body background non-scrollable when an image is open. I don't want users to be able to scroll up or down cause the image disappears. This can be solved adding a css class to the body when the image opens and then adding overflow: hidden to that body class or something like this but I don't find the script that adds the click listener to the thumbnails to add the body class. Perhaps this could be added as an option to the plugin.