Javascript MouseOver effect won't work

First of all, thank you for creating Simple Catch. I love it very much! I'm trying to implement a very cool Javascrpt Mouseover effect that is demonstrated on this site (in the output panel, hover over the word Wikipedia): http://jsbin.com/urarem/4/edit The effect works great on that site. It works great if you download the HTML file and open it with a browser. However, if I create a new Wordpress post (Simple Catch free theme), and paste the contents of that HTML file into a new post (text mode), and click the Preview button, this effect won't work at all on the preview page. Please help and thank you.