On the page http://functionalanalyticpsychotherapy.com/fap-research-in-sweden has a small photo gallery with a lightbox that appears when you click an image. This is done  as follows:

1. In the WordPress media library,  for each image you want as part of the gallery on a particular page or post, click attach and then select the appropriate page or post.

2. On the page or post where the gallery should appear enter: [gallery link=”file”]

3. Install and activate Auto Thickbox

4.  Add this CSS:

.gallery dl, .gallery dt {
	display:inline	}

You now have a simple but functional gallery!