Creating EMML markup from HTML

Question

I'm building a Mashup application which will generate output in EMML. The application is JavaScript based having an interface like Yahoo Pipes. Once the Mashup is designed in the editor, it needs to convert the same HTML markup to correct EMML markup.

I need to know if there is any Javascript framework or plugin available which converts the HTML markup to EMML and also parses EMML markup to HTML.