Add the following to the <head> section of the web page containing the gallery control (this is default.aspx in a standard GSP installation):
Code:<meta name="robots" content="noindex,nofollow" />
Use noindex when you don't want the search engines to add the page to their index. Use nofollow when you don't want the search engines to follow any links off of that page.
Roger Martin
Creator and Lead Developer of Gallery Server Pro