var ajaxWindowRequestObject;
function getTRNumber() {
	ajaxWindowRequestObject = createRequestObject();
	ajaxWindowRequestObject.open('get', 'http://www.harrahs.com/content/specialviewer.jsp'); 
	ajaxWindowRequestObject.onreadystatechange = ggwu_handleResponse;
	ajaxWindowRequestObject.send(null); 
}

/*
 * this function gets called when the AJAX call 
 * completes and will render the TR Number.
 */
function ggwu_handleResponse() { 
	 if (ajaxWindowRequestObject.readyState == 4 && ajaxWindowRequestObject.status == 200) {
		var response = ajaxWindowRequestObject.responseText; 
		if (response) {
			var stIndex = response.indexOf("__accountId");
			var endIndex = response.indexOf("</div>");
			var accountId = response.substring(stIndex+13,endIndex);
			writeCookie("trId", accountId, 0, "", ""); //write until browser is closed
		} 
	}   
}