@Clyde,

Yes, that's why I am suggesting adding the stylesheet to the classic/css in the mod download.

Possibly adding "Make sure style_imagehover.css is in your current template's css folder." to the "Other Troubleshooting Tips" will help as I did not find it when I first noticed the "problem."

I realize you can't make something "idiot proof", but you can try to anticipate some of their mistakes and head them off at the pass.