I've begun work on a Javascript Implementation.

[[http://www.ajaxhacking.com/lolcode.js|Download lolcode.js]] (Version 0.1 2007-06-15)

[[http://www.ajaxhacking.com/73/lolcode_js_0_1|Try it online]]

LOLCode.js doesn't yet support all of the language constructs, but it can run the [[http://www.lolcode.com/examples/hai-world|HAI WERLD]] and the [[http://www.lolcode.com/examples/count-1|COUNT!!1]] programs.