It's a pretty big oversight that the author didn't include or link to the actual script.

This is the unfortunate issue with CoffeScript thuogh; you can't see it in the page, or copy it, because coffescript is compiled into JavaScript before the page is rendered. This is one of the main impediments to adoption. It's easy to learn javascript by looking at examples, but you have to dig through open source software for examples of CoffeeScript.