< script type = "text/javascript" >
    function readCookie() {
    var utmz = readCookie('__utmz');
    var vals = (function () {
        var pairs = utmz.split('.').slice(4).join('.').split('|');
        var ga = {};
        for (var i = 0; i < pairs.length; i++) {
            var temp = pairs[i].split('=');
            ga[temp[0]] = temp[1];
        }
        return ga;
    })();

    dataLayer.push({
        'campaign_source': 'vals.utmcmd'
    });