Each thumbnail links to an 'iframe' page. The first thing to do is to place your photos on each of the iframe pages. In SiteSpinner, navigate to the photo3 page. Use the Mona Lisa icon to locate one of your photos, and place it in the top, left corner. Once you have done that come back to this page.
Next, import the same image to this page. While holding down the 'Ctrl' key on your keyboard, use the mouse to resize the image so that it is a 'thumbnail' - about the same size as the small images above. Place the image next to the small ones above.
You now need to create a link from the thumbnail image to the larger image. While the image is selected, open the Quick Editor (icon on the left tool bar) > Link tab. Copy and paste this text into the 'Code' field:
photo3.html target="photo1"
Repeat the steps above for each photo you want to add to your album. The trick is to modify the link text for each of the thumbnail images. So for the link to the photo4 image, you would enter:
photo4.html target="photo1"
You can then add more thumbnails for each photo using the method above.