[Plugin: NextGEN Gallery] Adding to the image link in an inserted gallery

Hi folks,

Where would I find the code to alter the hyperlink for an image loaded into a page by inserting a gallery? I have a site where I’d like to take the image’s title and add it to a link in the description eg. https://www.site.com/contact/?img=ImageTitle

The reason for this is that I’m building a site selling cars which will involve a gallery of used cars, each of which should link to the contact form page and pass a variable containing the name of the car.

Anybody know where I should be looking?

Cheers,
Robert