problem of captcha

My captcha session working fine in local server but it is not working
in main server.

iam giving code of my model, controller,view..etc.... pls rectify
it:-

My code of captcha for controller is:-
<?php

class CaptchaController extends AppController{

public $uses = array('SessionManager','Validator','Captcha','Flash');
public $components=array('Session');

function init(){
$this->SessionManager->Session=$this->Session;
}
function index(){
$this->init();
/*
$text = $this->SessionManager->get('captchaText');
$height = 25;
$width = 65;

$image_p = imagecreate($width, $height);
$black = imagecolorallocate($image_p, 0, 0, 0);
$white = imagecolorallocate($image_p, 255, 255, 255);
$font_size = 14;
ob_start();
imagestring($image_p, $font_size, 5, 5, $text, $white);
imagejpeg($image_p, null, 80);
exit;*/

$urlRoot=Router::url('/',false);
$image_width = 120;
$image_height = 35;
$characters_on_image = 6;
$dir = Configure::read('FondDir');
$font = $dir.'/monofont.ttf';
$possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
$random_dots = 0;
$random_lines = 20;
$captcha_text_color="0x142864";
$captcha_noice_color = "0x142864";
$code = '';
$i = 0;
ob_start();
while ($i < $characters_on_image) {
$code .= substr($possible_letters, mt_rand(0,
strlen($possible_letters)-1), 1);
$i++;
}
$this->SessionManager->set('captcha',$code);
$this->Session->write('captcha',$code);

$font_size = $image_height * 0.75;
$image = @imagecreate($image_width, $image_height);

/* setting the background, text and noise colours here */
$background_color = imagecolorallocate($image, 255, 255, 255);

$arr_text_color = $this->hexrgb($captcha_text_color);
$text_color = imagecolorallocate($image, $arr_text_color['red'],
$arr_text_color['green'], $arr_text_color['blue']);

$arr_noice_color = $this->hexrgb($captcha_noice_color);
$image_noise_color = imagecolorallocate($image,
$arr_noice_color['red'],
$arr_noice_color['green'], $arr_noice_color['blue']);

/* generating the dots randomly in background */
for( $i=0; $i<$random_dots; $i++ ) {
imagefilledellipse($image, mt_rand(0,$image_width),
mt_rand(0,$image_height), 2, 3, $image_noise_color);
}

/* generating lines randomly in background of image */
for( $i=0; $i<$random_lines; $i++ ) {
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
mt_rand(0,$image_width), mt_rand(0,$image_height),
$image_noise_color);
}

/* create a text box and add 6 letters code in it */
$textbox = imagettfbbox($font_size, 0, $font, $code);
$x = ($image_width - $textbox[4])/2;
$y = ($image_height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font ,
$code);

/* Show captcha image in the page html page */
header('Content-Type: image/jpeg');// defining the image type to be
shown in browser widow
imagejpeg($image);//showing the image
imagedestroy($image);//destroying the image instance

exit;
}

function hexrgb ($hexstr)
{
$int = hexdec($hexstr);

return array("red" => 0xFF & ($int >> 0x10),
"green" => 0xFF & ($int >> 0x8),
"blue" => 0xFF & $int);
}

}

?>

code for model is:-

<?php

class Captcha extends AppModel
{

private $captchaText;
private $canvasX;
private $canvasY;
private $fonts;
public $name='Captcha';
public $useTable = false;

function __construct($string,$width,$height)
{
$this->captchaText = $string;
$this->canvasX = $width;
$this->canvasY = $height;
putenv("GDFONTPATH=".dirname(dirname(__FILE__))."/webroot/fonts");
$this->fonts = array("Avgardn.ttf","frkgothi.ttf","lsansd.ttf");

}

function setText($string)
{
$this->captchaText = $string;
}
function getText()
{
return $this->captchaText;
}

function render()
{
$image = imagecreatetruecolor($this->canvasX,$this->canvasY);
$backGround = imagecolorallocate($image,255,255,255);
$borderColor =
imagecolorallocate($image,rand(125,250),rand(125,255),rand(0,125));
$textColor =
imagecolorallocate($image,rand(125,250),rand(0,255),rand(125,125));

$posY = ceil($this->canvasY/2);
$posX = ceil($this->canvasX/2);
$len = count($this->fonts);
$font = dirname(__FILE__)."/fonts/".$this->fonts[rand(0,$len-1)];
imagefilledrectangle($image,0,0,$this->canvasX,$this->canvasY,
$backGround);
//imagerectangle($image,5,5,$this->canvasX-5,$this-
>canvasY-5,$borderColor);
imagettftext($image,20,0,40,30,$textColor,$font,$this->captchaText);

ob_start();
header("Content-type:image/png");
imagepng($image);
ob_flush();

}

}

?>

and i called in view file like this:-

<tr>
<td><label>Captcha<em class="red">*</em></
label></td>
<td><img src="<?php echo $urlRoot;?>captcha/"
alt="Captcha Security Code" class="captcha" /></td>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>

but when form is submitte and i user to read value of session variable
like:-

echo $captcha = $this->SessionManager->get('captcha');

it is not getting.... pls rectify this

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