Solved - [checkout] button add "add to cart"

Gallery version = 2.1 core 1.1.0
PHP version = 5.0.4 cgi
Webserver = Apache
Database = mysql 4.1.18-standard-log, lock.system=flock
Toolkits = Exif, Getid3, ImageMagick, NetPBM, SquareThumb, Thumbnail, Gd
Acceleration = none, none
Operating system = Linux serv01.siteground118.com 2.6.14.2-grsec-grsec-test #1 SMP Fri Nov 18 02:27:52 CST 2005 i686
Default theme = matrix
Locale = en_US
Browser = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051010 Firefox/1.0.7 (Ubuntu package 1.0.7)

Is it possible to add a button/graphic for "Add photo to cart" instead of the text at the bottom of the photo? If so, where would I edit the code?

Thanks a head of time.