[stack] Public domain Cat interpreter in JavaScript

I've posted a public domain interpreter for a subset of the Cat
language online at http://www.cat-language.com/interpreter.html .

It was intended primarily as a demonstration of how implementing Cat
is trivial.
The source is public domain, so you can modify it and use it for any
purpose you want. I'm hoping that other language designers may find it
useful to extend for less trivial languages.

Have fun!
Christopher Diggins
http://www.cat-language.com