protected function _adapterFactory($adapter, $wsdl, $soap_options, $loglevel)
	{
		$adapter = ucfirst(strtolower($adapter));
		
		$file = '/QuickBooks/Adapter/Server/' . $adapter . '.php';
		$class = 'QuickBooks_Adapter_Server_' . $adapter;
		
		QuickBooks_Loader::load($file);
		
		if (class_exists($class))
		{
			return new $class($wsdl, $soap_options);
		}
		
		return null;
	}