Otto - Email tracking

// Parse the URL and gives the value for a given key
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

// Pass the value to the tag (example for a product tag)
<script type="text/javascript" src="//static.criteo.net/js/ld/ld.js" async="true"></script>
<script type="text/javascript">
window.criteo_q = window.criteo_q || [];
window.criteo_q.push(
        { event: "setAccount", account: 50545 },
        { event: "setSiteType", type: "d" },
        { event: "viewItem", item: "abc123456", utmmedium: getParameterByName("utm_medium") }
);
</script>