phpjs/experimental/language/$_COOKIE.js

php.js offers community built php functions in javascript

function $_COOKIE(name) {
  // http://kevin.vanzonneveld.net
  // +   original by: http://www.quirksmode.org/js/cookies.html
  // +   improved by: Steve
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: document.cookie = 'test=hello';
  // *     example 1: var $myVar = $_COOKIE('test'); // Note the round brackets!
  // *     returns 1: 'hello'

  var i = 0, c = '', nameEQ = name + '=',
      ca = document.cookie.split(';'),
      cal = ca.length;
  for (i = 0; i < cal; i++) {
    c = ca[i].replace(/^ */, '');
    if (c.indexOf(nameEQ) === 0) {
      return decodeURIComponent(c.slice(nameEQ.length).replace(/\+/g, '%20'));
    }
  }
  return null;
}