User blog comment:Revvie/New main page/@comment-25303181-20141125050135/@comment-25303181-20141126063422

That sounds like a good idea. Perhaps the talk page of that gallery could be used to vote which image appears on the slider once the gallery contains enough images, as there can only be one image in that position.

Since it is a single application of JavaScript, an online guide to JavaScript could be found with a search engine, and the index it would probably have could be used to find the information on how to do it. I may do this myself later on.