There used to be a button to have them wiggle the photos, to see them stereoscopically, but I can not find the button to do this. HELP!
Click on a photo and then at the top left you will see some settings. Yours is probably set to "normal". It is a dropdown and you can select "wiggle".
Are you looking at the "Traveling in the Holy Land through the Stereoscope" book rather than the media resource? If it is formatted like a book (with lots of descriptive text and page numbers) then try clicking one of the images. That will take you to the media resource where you have the option to change how it's viewed.
Totally forgot about that. Cool!