[AJAX]xmlhttp IE

var http = createRequestObject();

function createRequestObject() {
var req;
if(window.XMLHttpRequest){
      req = new XMLHttpRequest();
   } else if(window.ActiveXObject) {
      req = new ActiveXObject("Microsoft.XMLHTTP");
   } else {
      alert('Problem creating the XMLHttpRequest object');
   }
return req;
}

function sendRequest(cat,id) {
   http.open('get', 'filter_gui.php?cat='+cat+'&id='+id);
   http.onreadystatechange = handleResponse;
   http.send(null);
}

function handleResponse() {
   if(http.readyState == 4 && http.status == 200){
      var response = http.responseText;
      if(response) {
         document.getElementById("filter").innerHTML = response;
      }
   }
}

var http = createRequestObject();
 
function createRequestObject() {
var req;
if(window.XMLHttpRequest){
      req = new XMLHttpRequest();
   } else if(window.ActiveXObject) {
      req = new ActiveXObject("Microsoft.XMLHTTP");
   } else {
      alert('Problem creating the XMLHttpRequest object');
   }
return req;
}
 
function sendRequest(cat,id) {
   http.open('get', 'filter_gui.php?cat='+cat+'&id='+id);
   http.onreadystatechange = handleResponse;
   http.send(null);
}
 
function handleResponse() {
   if(http.readyState == 4 && http.status == 200){
      var response = http.responseText;
      if(response) {
         document.getElementById("filter").innerHTML = response;
      }
   }
}

} else if(window.ActiveXObject) {
alert(1);
req = new ActiveXObject("Microsoft.XMLHTTP");

} else if(window.ActiveXObject) {
alert(1);
req = new ActiveXObject("Microsoft.XMLHTTP");