Google Analytics Javascript Cookie Parser.
This parses google analytics cookies in javascript. This can be used to put tracking data dynamically in forms and so on.
Include the javascript code, or copy past in it in you page.
Then:
var parser = new GACookieParser();
// or new GACookieParser("cookie=string; key=value");
// uses document.cookies by default
parser.get('utmccn'); // return campaing id
parser.get('utmcsr'); // return referral source
parser.get('utmcct'); // return referring url path
parser.get('utmctr'); // return last search term used
parser.get('utmcmd'); // return medium