Captcha Control

Any direction would be great. Thanks in advance.

I believe that the ($codeVal) has to be installed somewhere with the else if (md5($code) == $_SESSION['image_random_value']) to facilitate setting of the error. Having difficulty making progress with this aspect of the validation!

Captcha control as follows from the validate.php:

PHP Code:

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        public function validateCode($codeVal, $codeName) {
        if (strlen($codeVal) <= 0) {
            $this->setError($codeName, "Enter Validate Code");            
        } else if (md5($code) == $_SESSION['image_random_value']) {        
            $this->setError($codeName, "Valid Code Required");
        }
    } 


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Captcha panel visible to visitor as follows from the contact.php:

HTML Code:

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<fieldset>
            <legend>Validate Form  <span class="errors"><?php echo $codeErr ?></span></legend>
                <span class="required">Required</span>
                <center>
                <img src="randomImage.php" alt="Captcha Image"/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                <input type="text" name="code" class="data"/>
                <!--Refresh Validate Code Button Facility-->                               
                <div id="flip"><a href onclick="history.go()" class="link" alt="Refresh Code" /></a></div>
                </center>
          </fieldset>

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and it looks like the visitorView.jpg image attached.