createEmptyMovieClip() and disable clicking

I have a image gallery that lists images dynamically and when you click the thumbnails the larger image loads on top of the thumbnails in a new “window” but i need to make it so you can’t blindly click through the large image onto the thumbs and make a “back” button to close kill the large preview window.

I’m hoping there is a:

clickable = false;

type command but i guess that’d be asking for too much.

any suggestions?