var request = new XMLHttpRequest();
request.onreadystatechange = function () {
    var DONE = this.DONE || 4;
    if (this.readyState === DONE){
       document.getElementById("dailyText").innerHTML = request.responseText;
    }
};
request.open('GET', 'calendar/'+today+'.txt', true);
request.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
request.send(null);

$.get('calendar/'+today+'.txt', function(text) {
   $('#dailyText').html(text);
});