$(document).ready(function() {
  var months = ['', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  var cm = 13;
  $("dl.full-calendar dt[m]").each(function(i) {
    var m = parseInt($(this).attr('m'), 10);
    if (m != cm) {
      cm = parseInt($(this).attr('m'), 10);
      $(this).before('<dd class="month">' + months[cm] + '</dd>');
    }
  });
});