Get the value of a cookie.

get-cookie.js

function getCookie(cookieName) {
	var allCookies = document.cookie.split(';'),
		cookieCounter = 0,
		currentCookie = '';
	for (cookieCounter = 0; cookieCounter < allCookies.length; cookieCounter++) {
		currentCookie = allCookies[cookieCounter];
		while (currentCookie.charAt(0) === ' ') {
			currentCookie = currentCookie.substring(1, currentCookie.length);
		}
		if (currentCookie.indexOf(cookieName + '=') === 0) {
			return currentCookie.substring(cookieName.length + 1, currentCookie.length);
		}
	}
	return false;
}