require_once() driving me MAD ! - please HELP

I have written a number of PHP include files. I have carefully partitioned them into logical folders - based on functionality. My directory structure looks something like this:

$(rootdir)/includes/
$(rootdir)/includes/patterns
$(rootdir)/includes/core/db
$(rootdir)/includes/core/utils
$(rootdir)/includes/core/logger
....

etc.

Each folder contains one or more files. I wrote the following script to test my db classes:

<?php
echo "In script\n" ;
include ("/db/mysql_database.inc.php");
echo "Got here\n" ;

try
{
echo "Attempting to instantiate db object\n" ;
$m_dbconnection = new MySQLDatabase();
echo "Object created succesfully\n" ;
}
catch (Exception $e)
{
echo "Exception caught : " . $e->getMessage() . "\n" ;
}
?>

Output: "In script Got here Attempting to instantiate db object "

I cannot, for the life of me, work out wtf is wrong iwth the script, and why I can't seem to use my directory structure. The above script is being run from $(rootdir). $(rootdir) is in folder htdocs under Apache.

Additional Info:
----------------------
PHP Version: PHP5
Web Server: Apache 2.0
OS: Windows 2K



.

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