if (file_exist($mosConfig_absolute_path.'/administrator/components/com_securityimages/client.php')) {

<?php include ($mosConfig_absolute_path.'/administrator/components/com_securityimages/client.php'); ?>

}

$packageName = 'securityChooseUniqueKeyName';

2. At the position where You want the Captcha image to be inserted 

<?php echo insertSecurityImage($packageName); ?>

<?php echo getSecurityImageText($packageName); ?>

 //will be replace at runtime, depending on user locale 

//with "Please Enter what You see:" 

<?php echo getSecurityImageTextHeader(); ?> 

//will be replace at run time, depending on user locale with 

//"If You do not see ...Hit reload" 

<?php echo getSecurityImageTextHelp(); ?>  

//will be replace at run time with the input box

<?php echo getSecurityImageField($packageName); ?>  

if (file_exist($mosConfig_absolute_path.'/administrator/components/com_securityimages/server.php')) {

include ($mosConfig_absolute_path.'/administrator/components/com_securityimages/server.php');

}

$packageName = 'securityChooseUniqueKeyName';

$security_refid  = mosGetParam( $_POST, $packageName.'_refid', '' );

$security_try      = mosGetParam( $_POST, $packageName.'_try', '' );

$security_reload = mosGetParam( $_POST, $packageName.'_reload', '' );

$checkSecurity = checkSecurityImage($security_refid, $security_try);

<param 

   name="useSecurityImages" type="radio" default="1" 

   label="Use SecurityImage Captcha"

   description="Enable Captcha verification">   

         <option value="0">No</option>

          <option value="1">Yes</option>

</param>

function displaySecurityImagesCaptcha() {  

        global $mainframe;  

        //Per contact you can define if the user has to resolve the capctha  

$contactId = JRequest::getVar('contact_id', 0, '', 'int');  

// load the contact details  

$model    = &$this->getModel('contact');  

$qOptions['id'] = $contactId;  

$contact        = $model->getContact( $qOptions );  

$params = new JParameter( $contact->params );  

        if ($params->get('useSecurityImages')) {      

            $check = null;  

            $mainframe->triggerEvent('onSecurityImagesDisplay', array($check));  

            if (!$check) {  

                echo "<br/>Erreur affichage du Captcha<br/>";  

            }  

        }  

    } 

function checkSecurityImagesCaptcha() {  

        global $mainframe;  

$contactId = JRequest::getVar('id', 0, '', 'int');  

// load the contact details  

$model    = &$this->getModel('contact');  

$qOptions['id'] = $contactId;  

$contact        = $model->getContact( $qOptions );  

$params = new JParameter( $contact->params );  

        //check if that user has a capctha  

if (!$params->get('useSecurityImages')) {   

            return true;  

        }  

$return = false;  

$securityImagesJoomlaContactUserTry = JRequest::getVar('securityImagesJoomlaContactUserTry', false, '', 'CMD');  

$mainframe->triggerEvent('onSecurityImagesCheck', array($securityImagesJoomlaContactUserTry &$return)); 

        return $return;

    }  

global $mainframe;  

if (!$this->checkSecurityImagesCaptcha()) { 

JError::raiseWarning("999","Invalid Captcha Code"); 

$this->display(); 

            return false; 

 }  

<?php if ($this->params->get('useSecurityImages')) { ?>

<img src="/index.php?option=com_contact&task=displaySecurityImagesCaptcha&contact_id=<?php echo $this->contact->id; ?>">  

<br />  

<input type="text" name="securityImagesJoomlaContactUserTry" />  

<br />  

<?php } ?> 

<img src="/index.php?option=com_securityimages&task=displaySecurityImagesCaptcha?>">  

<br />  

<input type="text" name="securityImagesmy3rdpartyExtensions" />  

<img src="/index.php?option=com_securityimages&task=displayCaptchaByPlugin&plugin=hncaptcha&version=1.0?>">  

<br />  

<input type="text" name="securityImagesmy3rdpartyExtensions" />  

To check user entry with the captcha define in administrator panel

$check = null;$userEntry = JRequest::getVar('userEntry', false, '', 'CMD'); 

$mainframe->triggerEvent('onSecurityImagesCheck', array($userEntry, $check));

if $check ==  true then user has solved the captcha

To check user entry with the captcha against a particular plugin implementation

$check = null;$check = null;

$userEntry = JRequest::getVar('userEntry', false, '', 'CMD'); 

$mainframe->triggerEvent('onSecurityImagesCheckByPlugin', array('hncaptcha', '1.0', $userEntry, $check));