getClientId()

function getClientId(){
    var clid = undefined;
    var match = document.cookie.match('(?:^|;)\\s*_ga=([^;]*)');
    var raw = (match) ? decodeURIComponent(match[1]) : null;
    if (raw)
    {
        match = raw.match(/(\d+\.\d+)$/);
    }
    var gacid = (match) ? match[1] : null;
    if (gacid)
    {
        clid=gacid;
    }else{

        clid=(gga_obj && 'clientId' in gga_obj)?gga_obj['clientId']:undefined;
    }
    return clid;
}