captcha php

<img id="captcha" src="securimage/securimage_show.php" alt="CAPTCHA Image"/>
<a onclick="document.getElementById('captcha').src = 'securimage/securimage_show.php?' + Math.random(); return false;" href="#">
    <p style="font-size: 8pt; text-align: center">Wygeneruj nowy</p>
</a>