You can optionally create a file called titles.txt to indicate the "title" for each image used in the on-line lecture index for jumping randomly around the lecture.
This file is not required and if present, it does not need to have a line for every image. It can have lines for images not used in this lecture.
The double quotes around the image file name and the title are required. lines with '#' in the first column are comments as are blank lines.