E-Commerce Configuration Guide : Site Configuration Settings : Item Settings : ImageRel
 
ImageRel
Key value:
lightbox
Description:
Used with the image column on the ItemList.aspx page. Used to support a light box viewer for displaying the Lg (large) image. Set ImageRel to lightbox to support a light box viewer.
Example:
ImageRel = lightbox
See also:
ImageField
ImageTnPath
ImageLgPath
Imagenodes