yes, i have also a top menu.php but i don't think that it changes something:
<div id="menu" >
<?php
// include functions
include_once('includes/functions.php');
// array to hold top menu
$top_menu_items = array(
'index.php' => array('text' => 'Home'),
'about.php' => array('text' => 'About'),
'contact.php' => array('text' => 'Contact')
);
// call the function that draws the menu
echo draw_menu($script_name, $top_menu_items);
?>
</div>