var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
var _gaq = _gaq || [];
_gaq.push(['_setAccount', params['ga_tracking_id']]);

// _gaq.push(["_trackEvent", "SmartVideoMetrics_Conversion", "CP Loaded"]); // create a custom event


ajax = {
ajaxGet: function(url, callback) {

var xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
xhr.open('GET', url);
xhr.onreadystatechange = function() {
if (xhr.readyState > 3 && xhr.status === 200) {
callback(xhr.responseText);
}
};
xhr.send();

return xhr;
}
};
ajax.ajaxGet(params['server_url'] + '/t/c/' + params['user_id'], function(data) {
 // blank
});