Recaptcha need help

[eluser]crimsun[/eluser]
Hello Friend,

I am creating the captcha from one of the demo that i got from internet...but its not recaptcha its just simple captcha And i need to regenerate the If i am not getting the current code....

For this also i have some core php file and that display the image and this file is declared in root folder of the main project and they use for saving session variable as

Code:

$_SESSION['securimage_code_value'] = $this->code;

But its not work for me at all ...Then i am trining to cut paste that file from root to system/application/library but its not working any more...so can you please suggests me if any solution ....

Code for my view page:-

Code:

<tr>
    <td align="right" ><b>Verification</b></td>
    <td align="left"><table width="100%" border="0" cellspacing="0" cellpadding="0">
    <tr>
    <td width="40%" align="left" valign="middle" nowrap="nowrap"><img src="&lt;? echo site_url();?&gt;captcha/securimage_show.php" id="image" align="middle" alt="Captcha" /> </td>
    <td width="60%">
     <a ><img src="&lt;? echo site_url();?&gt;captcha/images/img_change.gif" border="0" alt="Change"/></a></td>
    </tr>
    </table>
    <label></label></td>
   </tr>

And i here by attched the zip file from which i generate the captcha