css
HiFi asked:

Each CSS class will have a background image assigned to it, and the image will appear in the background of a DIV tag. The DIV will have an ID assigned to it, which will control the dimensions, etc, but the actual class will only contain a background image.

How do I best do that? I am only working in HTML, JS and CSS, since I am making a CD-ROM, which will obviously not be able to use PHP, ASP, etc.