//Load modules
$res_modules = mysql_query("SELECT * FROM ".$db_prefix."modules WHERE enabled=1");
echo mysql_error();
while($row_modules = mysql_fetch_array($res_modules))
{
    //Check if module exists
    if(file_exists("MODULES/".$row_modules["name"]."/module.php"))
    {
    	require_once("MODULES/".$row_modules["name"]."/module.php");//Include module
    }
    else//Module does not exists...
    {
    	//...so deactivate it
    	mysql_query("UPDATE ".$db_prefix."modules SET enabled=0 WHERE name='".$row_modules["name"]."'");
    }
}

$req_modules = array("page", "comments");

function include_module($module_name) {
	static $already_included_modules;
	if (!isset($already_included_modules))
		$already_included_modules = array();
	require_once('MODULES/' . $row['name'] . '/module.php');
	$class = 'Module_' . $row['name'];
	$module_instance = new $class;
	if (!empty($class->req_modules)) {
		foreach ($class->req_modules as $req_module) {
			if (isset($already_included_modules[$req_module])) continue;
			include_module($req_module);
		}
	}
	$already_included_modules[$module_name] = true;
}