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<?php
$captchacode = rand();
?>               

<img src="comment/Generate_Captcha_Code.php?rand=<?php echo $captchacode; ?>" id='captchaimg'>  



<a href='javascript: refreshCaptcha();' >
    <div class="refreshbox">
        <div class="refresh-img" style="margin-top: -26px; margin-right: -10px;">        

            <img style="border:none;" src="comment/img/refresh.png" title="Click to change the code"  class="pull-right" />

        </div>
    </div>
</a>



<script language='JavaScript' type='text/javascript'>



    function refreshCaptcha() {

        var img = document.images['captchaimg'];

        var c = Math.round(Math.random() * 10000);

        img.src = img.src.substring(0, img.src.lastIndexOf("?")) + "?rand=" + c;

    }



</script>