Dr. Byte has confirmed that if there ANY .js scripts installed in the custom YOUR_TEMPLATE/jscript folder, none of the scripts in the TEMPLATE_DEFAULT folder will be used. So the jscript_imagehover.js file should be installed in the working (custom) jscript folder rather than OR IN ADDITION TO the TEMPLATE_DEFAULT folder in order for the hover image effect to work.

http://www.zen-cart.com/forum/showth...873#post402873