Take a look at this page: http://givebackindia.com/contact-us
There is a captcha there.  Looking at the source he has used some kind
of JS / AJAX event for updating the captcha:

<div style="float:left;width:250px;"><a href="/default/regenerate
code" id="link1533302884" onclick=" event.returnValue = false; return
false;">Can not read this code? Reload.</a><script type="text/
javascript">
//<![CDATA[
Event.observe('link1533302884', 'click', function(event) { new
Ajax.Updater('captchaID','/default/reload_captcha?',
{asynchronous:true, evalScripts:true, requestHeaders:['X-Update',
'captchaID']}) }, false);
//]]>
</script></div>

Do you know how to achieve this?

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