[Need Help] Captcha image doesnt work

[eluser]daynie[/eluser]
this the captcha code locate in my controller folder

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<?php

class Captcha extends Controller
{
//Constructor
function Captcha()
{
parent::Controller();
}
function index()
{
//Load the captcha plugin
$this->load->plugin('captcha');
//Create the captcha image
$randKey = rand();
$vals = array('word' => $this->_randomPassword(5, $randKey), 'img_path' => BASEPATH . '../application/images/captcha/', 'img_url' => base_url() . 'application/images/captcha/', 'font_path' => BASEPATH . '../application/fonts/verdana.ttf', 'font_size' => 25, 'img_width' => 150, 'img_height' => 30, 'expiration' => 7200);
$cap = create_captcha($vals);
echo $cap['word'] . '|' . $cap['time'] . '|' . $randKey;
}
function _randomPassword($length = 8, $seed = '')
{
$password = "";
$possible = "0123456789";
$i = 0;
mt_srand(($seed == '') ? rand() : $seed);
while ($i < $length)
{
$char = substr($possible, mt_rand(0, strlen($possible) - 1), 1);
if (!strstr($password, $char))
{
$password .= $char;
$i++;
}
}
return $password;
}
}
?&gt;
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and there are many file with .tpl extention in the view folder, i dont know which one suppose to b show