function getCookie (cookieName) {
var cookieValue = document.cookie;
var cookieStartsAt = cookieValue.indexOf(" " + cookieName + "=");

if (cookieStartsAt == -1) {cookieStartsAt = cookieValue.indexOf(cookieName + "=");}

if (cookieStartsAt == -1) {cookieValue = null;}
else {cookieStartsAt = cookieValue.indexOf("=", cookieStartsAt) + 1;}

var cookieEndsAt = cookieValue.indexOf(";", cookieStartsAt);
if (cookieEndsAt == -1) {cookieEndsAt = cookieValue.length}

cookieValue = unescape (cookieValue.substring(cookieStartsAt, cookieEndsAt));

return cookieValue;

}