Searching for an instance of a movie clip?

I’m working on a website I did not create and I’m trying to locate an instance of a movie clip. There’s a function on my buttons which call:

_root.newSec = “gallery.swf”

I have no idea where ‘newSec’ is, and I need to know for other reasons. Is there a way to search my flash document, or timeline for this instance? Thanks.