[eluser]_asdf[/eluser]
if its coming from an external file, you'll need to:
Code:
$this->config->load('yourConfigFile');
or autoload it.
if you just need to access the config variable, use
Code:
$this->config->item('array hash/index');
[url="http://ellislab.com/codeigniter/user-guide/libraries/config.html"]see the user-guide[/url].