function readCookie(name) {
	var cookieEQ = name + '=';
	var cookieAll = document.cookie.split(';');
	for(var i = 0; i < cookieAll.length; i++) {
		var cookie = cookieAll[i];
		while(cookie.charAt(0) == ' ') cookie = cookie.substring(1,cookie.length);
		if(cookie.indexOf(cookieEQ) == 0) return cookie.substring(cookieEQ.length, cookie.length);		
	}
	return null;
}