(function($){
  $.fn.makeMarkdown = function(settings){
    this.each(function(){
      var $elem = $(this);
      html_raw = $elem.html();
      var converter = new Showdown.converter();
      var html_done = converter.makeHtml(html_raw);
      $elem.replaceWith(html_done);
      return html_done;
    });
    return this;
  };
})(jQuery);