Google RECAPTCHA:

<div class="wa-captcha wa-recaptcha">
    <a class="wa-captcha-refresh" style="display:none;"></a>
    <div class="g-recaptcha initialized"><div style="width: 304px; height: 78px;"><div><iframe src="https://www.google.com/recaptcha/api2/anchor?k=123&amp;co=aHR0cDovL3dhLmxhbjo4MA..&amp;hl=ru&amp;v=r20171109115411&amp;size=normal&amp;cb=rvrma6hhf234" width="304" height="78" role="presentation" frameborder="0" scrolling="no" sandbox="allow-forms allow-popups allow-same-origin allow-scripts allow-top-navigation allow-modals allow-popups-to-escape-sandbox"></iframe></div><textarea id="g-recaptcha-response" name="g-recaptcha-response" class="g-recaptcha-response" style="width: 250px; height: 40px; border: 1px solid #c1c1c1; margin: 10px 25px; padding: 0px; resize: none;  display: none; "></textarea></div></div>
</div>










wa-captcha:

<div class="wa-captcha">
    <p>
        <img class="wa-captcha-img" src="/shop/captcha.php?rid=15108364235a0d88c79e5c0" alt="CAPTCHA" title="Обновить капчу (CAPTCHA)">
        <strong>→</strong>
        <input type="text" name="captcha" class="wa-captcha-input" autocomplete="off">
    </p>
    <p>
        <a href="#" class="wa-captcha-refresh">Обновить капчу (CAPTCHA)</a>
    </p>
    <script type="text/javascript">
    $(function() {
        $('div.wa-captcha .wa-captcha-refresh, div.wa-captcha .wa-captcha-img').click(function(){
            var div = $(this).parents('div.wa-captcha');
            var captcha = div.find('.wa-captcha-img');
            if(captcha.length) {
                captcha.attr('src', captcha.attr('src').replace(/\?.*$/,'?rid='+Math.random()));
                captcha.one('load', function() {
                    div.find('.wa-captcha-input').focus();
                });
            };
            div.find('input').val('');
            return false;
        });
    });
    </script>
</div>