need a button to get thumbnails.

In the gallery page, one can click the <<Prev and Next>> button to get the next picture, or click on one of the 6 thumbnails to skip over pictures that have been seen already.

However, if all 6 thumbnail has been seen before, the only way to skip forward is to click on the 6th thumbnail. It would be nice to add another button to roll in another 6 thumbnail without needing to load the big picture unnecessarily.