Finds everything with class="replace" and throws it through handlebars against a loaded config file.

self_replace.js

function replace() {
  var source, template, html;
  $.getJSON( "/config.json", function( data ) {
    $('.replace').each(function () {
      source = $(this).parent().html();
      template = Handlebars.compile(source);
      html = template(data);
      $(this).parent().html(html);
    });
  });
};