[Plugin: NextGEN Gallery] Safe move of single gallery base to a multisite

I use in a single wp site the next gen gallery. And I want to merge this site to a multisite. Logically in order to see the photos again I have to move itthe files with my albums to the corresponding “wp-content/blogs.dir/*”.

After I do that, logically I have problems with google and any other search engine that it has indexing my albums with path “wp-content/gallery/”

Which redirect command I have to put at my .htaccess, so that the original path name will redirect to the corresponding new path name that has the albums with the photos in the multisite?

http://wordpress.org/extend/plugins/nextgen-gallery/