/**
  * @private
  * @static
  * Sets the right domain for the cookie
  * @return nothing
  */
 function setSessionCookieDomain()
 {
     $scriptUrl = HttpVars::getBaseUrl();
     $url = new Url($scriptUrl);
     $domain = $url->getHost();
     // this won't work for top level domains and domains such as
     // 'localhost' or internal domains for obvious security reasons...
     // See comments in http://fi.php.net/manual/en/function.session-set-cookie-params.php
     if (count(explode('.', $domain)) > 1) {
         return $domain;
     }
 }