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I've started putting together the framework for a curing system for the HTML5 client, and decided I'd open it up for people to be able to contribute to it. It's a public git repository, so if you'd like to contribute, feel free! Pull it down, make a new branch and then put in a pull request when you're ready to have your changes added to the main script.
Testing is relatively simple - you'll just need to put your version up somewhere and then reference it in your onLoad function $.getScript("http://url.com/filename.js