[horde] check if the user was login

[Peter Mueller]

hello

we make another application that should work with horde. which are the lines 
that i must put in the top of the script, to check if the user haved login 
with correct username/password?

this example doesn't work:
define('IMP_BASE', dirname(__FILE__).'/');
require_once IMP_BASE . '/lib/base.php';

if (!Auth::getAuth())
{
 header("Location: http://domain.com");
 exit;
}

with regards
peter

(version: horde 2.2.4, imp 3.2.2)