XMLHttpRequest() with IE

The script below is working fine with Firefox and Chrome but I cant seem to get it to work with IE, tried everything, even lowered the security on my browser to see if was that blocking it, but I still cant get it to work.

<script type="text/javascript">
  function postData() {
      var http = new XMLHttpRequest();
      var url = "/scripts/remove_fr.php";
      var params = "";
      http.open("GET", url, true);

      //Send the proper header information along with the request
      http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http.setRequestHeader("Content-length", params.length);
      http.setRequestHeader("Connection", "close");

      http.onreadystatechange = function() { //Call a function when the state changes.
          if (http.readyState == 4 && http.status == 200) {

          }
      }

      http.send(params);
  }

  $("#qwerty").click(function() {
      $('#qwerty').remove();
  });
</script>

You're already using jQuery, so use jQuery's AJAX utility functions! Don't try to roll your own; the XMLHttpRequest API is ugly and annoying.

I'd like to provide sample code, but right now what you've got amounts to simply:

$.get("/scripts/remove_fr.php");

which isn't much of an example. ;)