Spoiler Enhanced Help?

Hi, I just recently downloaded the plugin from:
https://liberitas.com/2006/04/18/mi-plugin-simple-spoiler-enhanced/

But it doesn’t seem to work for me? After I install it and everything, nothing happens. It’ll hide the part of the post that I want hidden, but it won’t show or reveal it when I click on it, like it’s supposed to.

Does anyone else have that problem? I’m currently using WordPress 2.0.1 but that shouldn’t be the problem because I’ve seen it being used on other WordPress blogs that are also running 2.0.1.