You can configure which part of your site would like to search in Basic / Sites to search section of Google Custom Search page (available here: https://cse.google.com)
You can use URL filters for your Nextgen gallery URL.
You can configure which part of your site would like to search in Basic / Sites to search section of Google Custom Search page (available here: https://cse.google.com)
You can use URL filters for your Nextgen gallery URL.