Retargeting Criteo Sociomantic split

retargeting_split.js

<script type="text/javascript">
    var getCookie = function(name) {
        var match = document.cookie.match(new RegExp(name + '=([^;]+)'));
        if (match) return match[1];
    }
    var ab_retarget = getCookie('ab_retarget_v1');

    if (ab_retarget == undefined) {
        if (Math.round(+new Date() / 1000) % 2) {
            ab_retarget = 'sociomantic';
        } else {
            ab_retarget = 'criteo';
        }
        document.cookie = "ab_retarget_v1=" + ab_retarget + ';path=/';
    }
    dataLayer.push({'ab_retarget': ab_retarget});
</script>