.com/theme/templates/body-js.html

<script type="text/javascript" charset="utf-8">
  jQuery(function($){
    function underscore(str) {
      return str.replace(/::/g, '/')
                .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
                .replace(/([a-z\d])([A-Z])/g, '$1_$2')
                .replace(/-/g, '_')
                .toLowerCase();
    }

    function dasherize(str) {
      return underscore(str).replace(/_/g, '-');
    }

    $("h1").each(function(){
      var name = $(this).text();
      $(this).attr("id", "h-" + dasherize(name));
    });

    $("h2").each(function(){
      var name = $(this).text();
      $(this).attr("id", "s-" + dasherize(name));
    });
  });

  jQuery(function(){

    $("pre").wrapInner('<code>')
  });

</script>