Extern links with session ID?

[allstar55]

Hi,

in my extern page is this in the header:

<?php
chdir("/home/www/privat/xxxxxx/html/forum");
require('./global.php');
include('./includes/functions_user.php');
?>

How can i include the session in my normal links?
<a href="http://www.domain.com/index.php">Home</a>

Please help