mailchimp-popup-button.html

<script type="text/javascript" src="//downloads.mailchimp.com/js/signup-forms/popup/unique-methods/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"></script>
<script type="text/javascript">
    function showMailingPopUp() {
        window.dojoRequire(["mojo/signup-forms/Loader"], function (L) {
            L.start({
                "baseUrl": "mc.us19.list-manage.com",
                "uuid": "f135c2db40c105c2927c91ba0",
                "lid": "a0227cec63",
                "uniqueMethods": true
            });
        });
        document.cookie = 'MCPopupClosed=;path=/;expires=Thu, 01 Jan 1970 00:00:00 UTC;';
        document.cookie = 'MCPopupSubscribed=;path=/;expires=Thu, 01 Jan 1970 00:00:00 UTC;';
    }
</script>
<a onclick="showMailingPopUp()">click me</a>