how can i use data from custom config in custom helper file

[eluser]gon[/eluser]
You must get a reference to the CI object.

Code:

function image($sImageName)
{
    $CI =& get_instance();
    return base_url() . $CI->config->item('images', 'design') . $sImageName;
}

the same thing occurs in libraries and models.

cheers.