[ruslan_mart]

var xmlhttp = new XMLHttpRequest();
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("GET", "nalog_calendar.xml", true);
xmlhttp.onloadend = function() {
   var doc = document.createElement("div");
   doc.innerHTML = this.responseText;

   console.log(doc.getElementsByTagName("day")[3].getAttribute("15"));
};
xmlhttp.send();