[fw-auth] How to set up OpenID authentication

How to set up OpenID authentication, something of that like StackOverflow. i tried the code from http://framework.zend.com/manual/en/zend.auth.adapter.openid.html

$status = ""; $auth = Zend_Auth::getInstance(); if ((isset($_POST['openid_action']) &&      $_POST['openid_action'] == "login" &&      !empty($_POST['openid_identifier'])) ||     isset($_GET['openid_mode']) ||     isset($_POST['openid_mode'])) {     $result = $auth->authenticate(         new Zend_Auth_Adapter_OpenId(@$_POST['openid_identifier'])); ...

this code does not seem to be working... i keep getting posted back to the same page

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