// Sets cookie values. Expiration date is optional
function setCookie(name, value, expire) {
	document.cookie = name + "=" + escape(value) +
	((expire == null) ? "" : ("; expires=" + expire.toGMTString())) +
	"; path=/";
}
function getCookie(name) {
	var search = name + "=";
	if (document.cookie.length > 0) { // if there are any cookies
		offset = document.cookie.indexOf(search);
		if (offset != -1) { // if cookie exists
			offset += search.length;
			// set index of beginning of value
			end = document.cookie.indexOf(";", offset);
			// set index of end of cookie value
			if (end == -1) end = document.cookie.length;
			return unescape(document.cookie.substring(offset, end));
		}
	}
	return null;
}