The post has been deleted and cannot be recovered. However, it is pretty easy to change the border color of the active thumbnail image. You can find some of the demos are changing the border colors for the active one. Just open the stylesheet and change the border-color for the li.active selector.
Also note that only the showMode of 2 or 3 in the thumbnail-slider.js file is supposed to have active thumbnail. So make sure the showMode has been set to 2 or 3.
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