I have installed your SM Gallery plugin and made a test page with a few images, see http://kc-shertogenbosch.nl/wordpress/test-galleria/.
When you click on a thumb, not only the image is loaded in the frame, but also a popup is shown with a large(r) version of the image. This is not what I want.
Normally I use the gallery that's included in the theme, but my client doesn't like that one and wants a gallery like yours. Perhaps there is a conflict with other js, but I am not a js professional, so...
Can you help please?
Thanks and regards,