Проблемы с xmlHttpRequest

function followLink(event, link)
			{
				
				var nameLink = link.innerHTML;
				uploadContent(link.href+'&ajax=1');
				history.pushState({title:nameLink, href:link.href}, null, link.href);
				updateTitle(nameLink);
				event.preventDefault();
			}

			function updateTitle(title)
			{
				var link = document.createElement('link');
				document.getElementsByTagName('head')[0].appendChild(link);
				link.setAttribute('type','text/css');
				link.setAttribute('rel','stylesheet');
				link.setAttribute('href','/templates/styles/player.css');
				link.setAttribute('type','text/javascript');
				link.setAttribute('rel','javascript');
				link.setAttribute('href','/templates/js/jquery.jplayer.js');
				var elm = document.getElementsByTagName('title')[0];
				elm.DOM = title;
			}

			function uploadContent(link)
			{
				  var cont = document.getElementById('content');
				  cont.innerHTML = loading.innerHTML;
				 function createRequestObject() {
				 processData:false
				  if (typeof XMLHttpRequest === 'undefined') {
					XMLHttpRequest = function() {
					  try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); }
						catch(e) {}
					  try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); }
						catch(e) {}
					  try { return new ActiveXObject("Msxml2.XMLHTTP"); }
						catch(e) {}
					  try { return new ActiveXObject("Microsoft.XMLHTTP"); }
						catch(e) {}
					  throw new Error("This browser does not support XMLHttpRequest.");
					};
				  }
				  return new XMLHttpRequest();
				}
 
				  var http = createRequestObject();
				  if( http ) {
				  http.open('get', link);
				  http.onreadystatechange = function () {
				  if(http.readyState == 4) {
				  			$("#content").css("display", "none");
							$("#content").fadeOut(1000);

							$("#content").fadeIn(2000);
					
				  cont.innerHTML = http.responseText;
				  }
				  }
				  http.send(null);  
				  } else {
				  document.location = link;
				  }
			}

			window.addEventListener("popstate", function(e) {
				uploadContent(e.state.href);									 
				updateTitle(e.state.title);
			}, false );