function createRequest() {
 try {
   request = new XMLHttpRequest();
 } catch (trymicrosoft) {
   try {
	 request = new ActiveXObject("Msxml2.XMLHTTP");
   } catch (othermicrosoft) {
	 try {
	   request = new ActiveXObject("Microsoft.XMLHTTP");
	 } catch (failed) {
	   request = null;
	 }
   }
 }

 if (request == null)
   alert("Error creating request object!");
}

function replaceText(el, text) {
  if (el != null) {
    clearText(el);
    var newNode = document.createTextNode(text);
    el.appendChild(newNode);
  }
}

function clearText(el) {
  if (el != null) {
    if (el.childNodes) {
      for (var i = 0; i < el.childNodes.length; i++) {
        var childNode = el.childNodes[i];
        el.removeChild(childNode);
      }
    }
  }
}

function getText(el) {
  var text = "";
  if (el != null) {
    if (el.childNodes) {
      for (var i = 0; i < el.childNodes.length; i++) {
        var childNode = el.childNodes[i];
        childNode.normalize();
        if (childNode.nodeType == Node.TEXT_NODE) {
          text = text + childNode.data;
        }
      }
    }
  }
  return text;
}

function setReferrer(){
	createRequest();
	var url = "/setReferrer.php?referrer="+document.referrer;
	request.open("GET", url, true);
	request.onreadystatechange = donothing;
	request.send(null);
}

function donothing(){
	// doing nothing
}