Only Affect One Gallery

Adding a custom link to one image in one gallery, seems to affect the linking on that image on ALL galleries anywhere on the site. Is there a way to only affect the linking on a gallery photo in a single gallery?

http://wordpress.org/plugins/custom-content-width/