if(document.cookie.indexOf('visitorID') == -1){
	var today = new Date();
	var expireCookie = new Date(today.getTime() + 3650 * 24 * 60 * 60 * 1000);
	
	var cookieValue = 'visitorID=' + navigator.platform + escape(getRandomNumber()) + '; expires=' + expireCookie.toGMTString() + '; path=/';
	document.cookie = cookieValue;
}