want to acess file outside the admin config.php

In other servers, for directory path, we will use
$_SERVER['DOCUMENT_ROOT']

but for this server it is taking just '/' is coming for the yahoo server


and in admin folder there is index.php file there is code
<?php include('../config.php');

this is not working can any one please suggest me how can i write code properly

Thank you in advance

 

I found a pretty detailed post about acessing the file outside the admin config.php here:

http://www.phpfreaks.com/forums/index.php?topic=310511.0

Hopefully this will help.