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Lightbox next and prev buttons

I have an image gallery and when an image is clicked, a lightbox appears with the clicked image appended to it. The lightbox also has a button appended to it. I'm trying to write the code so that, when the button is clicked, the current image is detached from the lightbox and the next image in the gallery is appended to it.

Any suggestions on where I'm going wrong would be greatly appreciated.

This is the link with the source: https://teamtreehouse.com/library/jquery-basics/creating-a-simple-lightbox/perform-part-4