Accessing php file in controllers

[eluser]Musaddiq Khan[/eluser]
Hello every body,
I m configuring authoriz.net in codeigniter. I've place the file in controllers folder as the path shows it.

Code:

\\localhost\wwwroot\furniture\application\controllers\anet_php_sdk

.
I'm accessing the files in controller located at root in controller folder which is working fine.
And also I need to access the same files in a subfolder in controllers like

Code:

\localhost\wwwroot\furniture\application\controllers\AdminArea\order

.
I've tried the following two options

Code:

require_once 'anet_php_sdk/AuthorizeNet.php';

Code:

require_once '../anet_php_sdk/AuthorizeNet.php';

but both the line generating errors.
Fatal error: require_once() [function.require]: Failed opening required 'anet_php_sdk/AuthorizeNet.php' (include_path='.;C:\\php\\pear').

Any help will be appriciated.

[eluser]PravinS[/eluser]
Don't include files in controller, instead try using helpers.