и това ти е да кажем картинката<script type="text/javascript">
function refresh_image(image) {
document.getElementById('my_image').src = image + '?' + Math.random();
}
</script>
<img src="изображението.формата" onClick="refresh_image(this.src);" id="my_image" />
<img src="captcha.php" onClick="refresh_image(this.src);" id="my_image" />
<a href="#" onclick=" document.getElementById('captcha').src = document.getElementById('captcha').src + '?' + (new Date()).getMilliseconds()">Обнови</a>
<img src="img.php" id="captcha" alt="Image captcha" />