javascript POST

 have this in the head tag:

<script>
var url = "www.google-analytics.com";
var method = "POST /collect HTTP/1.1";
var postData = "v=1&t=event&tid=UA-XXX&cid=XXX&ec=gameTest&ea=newTest&el=testCampaign&ev=1";

var async = true;

var request = new XMLHttpRequest();

request.onload = function () {


   var status = request.status; // HTTP response status, e.g., 200 for "200 OK"
   var data = request.responseText; // Returned data, e.g., an HTML document.
}

</script>

and this in a test button:

<button id="button" href="#newGame" onclick="request.open(method, url, async);request.send(postData);">Please click2</button>