Nextgen – Display a specific gallery in sidebar widget for specific page

If say for example I had 5 different pages
1. Horse
2. Cow
3. Dog
4. Cat
5. Sheep

I create 5 different nextgen galleries with content as named above.
How do I get a specific gallery to view on the right sidebar. So the horse gallery needs to show on the horse sidebar widget and so on.
I am quiet new to all of this. In fact this is my 1st site http://www.ridesonthewildside.com
Hope it makes sense above

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