cookie.js

(function ($) {

  $.cookie = function (name, value, options) {
    if (typeof value != 'undefined') {

      options = options || {};
      if (value === null) {
        value = '';
        options.expires = -1;
      }

      if (typeof value == 'object' && $.toJSON) {
        value = $.toJSON(value);
      }
      var expires = '';

      if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
        var date;
        if (typeof options.expires == 'number') {
          date = new Date();
          date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
        }
        else {
          date = options.expires;
        }
        expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
      }

      var path = options.path ? '; path=' + (options.path) : '';
      var domain = options.domain ? '; domain=' + (options.domain) : '';
      var secure = options.secure ? '; secure' : '';

      document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    }
    else { // only name given, get cookie
      var cookieValue = null;
      if (document.cookie && document.cookie != '') {
        var cookies = document.cookie.split(';');
        for (var i = 0; i < cookies.length; i++) {
          var cookie = $.trim(cookies[i]);

          if (cookie.substring(0, name.length + 1) == (name + '=')) {

            cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
            break;
          }
        }
      }

      if ($.evalJSON && cookieValue && cookieValue.match(/^\s*\{/)) {
        try {
          cookieValue = $.evalJSON(cookieValue);
        }
        catch (e) {}
      }
      return cookieValue;
    }
  };

  return $;
})(jQuery);