Overview
An annotated album of the images in a folder has two parts: a thumbnail index and a set of images with (in some cases) descriptions.
Index Pages
The thumbnail index appears first; it may consist of several pages. It
contains thumbnail (miniature) versions of all the images in the album.
(Below each thumbnail is the image filename.) If you click on a thumbnail
or image filename, you will go to the album page with that image and
(if available) its description.
Index Navigation
At the top of the index page is a title
and (when the index consists of several pages) some navigation buttons at the left.
Clicking on 
takes you to the next index page
for the current folder, and clicking on 
takes you to the previous index page.
Image Navigation
When you are viewing images in an album, the upper right corner
of each page is used for navigation:
takes you to the next image, takes
you to the previous image, and 
takes you back to the index for this folder.