I found this jQuery plugin for WMD after a quick search: https://github.com/openlibrary/wmd
This is a fork of the Dana SO version, and one of the main changes in Readme claims that it can work with multiple text fields on one page , and this is the jQuery plugin.
Include the script in your page, and then name it in your text areas as follows:
$(function() { $('textarea.wmd').wmd(); });
As far as I know, this answers your question.
ndbroadbent
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