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<!-- Expire cookie in one year -->
function setcid() { 
    var now = new Date();
    var time = now.getTime();
    var expireTime = time + 3600 * 1000 * 24 * 365;
    now.setTime(expireTime);
    document.cookie = 'miva_customerid=&mvt:global:customer:bill_email;;expires='+now.toGMTString()+';path=/';
}
setcid();