function vbstrtolower($string)
{
    global $stylevar;
    if (function_exists('mb_strtolower') AND $newstring = @mb_strtolower($string, $stylevar['charset']))
    {
        return $newstring;
    }
    else
    {
        return strtr($string,
            'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
            'abcdefghijklmnopqrstuvwxyz'
        );
    }
}