customizing main pretty plugins page

Trying to do something which *should be* incredibly simple… add a basic toggle to my pretty plugins template page. Here’s the toggle code:

http://fiddle.jshell.net/LyndseyB/5S4mH/show/

I’ve tried adding the javascript both to the main template page as well as theme.js. Could there be something preventing this JS from loading/firing? Or some kind of jquery conflict? Any tips appreciated…