you can run phpinfo.php
PHP Code:
<? phpinfo() ?>
and it will show you the dir paths of your setup as well as the settings you have in php.
If includes is a problem you can try changing the includes path in php.ini
Ive also tried to create a .htaccess file with the path to my includes dir as so:
Code:
php_value include_path .:/usr/local/httpd/htdocs/includes
*changing the path to reflect your server dir of course.