function geoTracker(feed)
{
  var thisRequestObject;
  var phpTracker = '/tracker.php';
  var params = 'feed=' + feed;
  
  if (window.XMLHttpRequest) {
    thisRequestObject = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    thisRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
  }
  
  thisRequestObject.open("POST", phpTracker, true);
  thisRequestObject.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  thisRequestObject.send(params);
}