var iCookieLength = 30; // Cookie length in days
        var sCookieName = "aw_source"; // Name of the first party cookie to utilise for last click referrer de-duplication
        var sSourceParameterName = "utm_source"; // This is the name of the parameter used by your organisation that identifies the source of traffic that drove the user click. Please update this value accordingly

        var _getQueryStringValue = function (sParameterName) {
            var aQueryStringPairs = document.location.search.substring(1).split("&");
            for (var i = 0; i < aQueryStringPairs.length; i++) {
                var aQueryStringParts = aQueryStringPairs[i].split("=");
                if (sParameterName.toLowerCase() == aQueryStringParts[0].toLowerCase()) {
                    return decodeURIComponent(aQueryStringParts[1]).replace(/[^A-Z0-9]+/ig, "");
                }
            }
        };
        var _setCookie = function (sCookieName, sCookieContents, iCookieLength) {
            var dCookieExpires = new Date();
            dCookieExpires.setTime(dCookieExpires.getTime() + (iCookieLength * 24 * 60 * 60 * 1000));
            document.cookie = sCookieName + "=" + sCookieContents + "; expires=" + dCookieExpires.toGMTString() + "; path=/;";
        };
        if (_getQueryStringValue(sSourceParameterName)) {
            _setCookie(sCookieName, _getQueryStringValue(sSourceParameterName), iCookieLength);
        }
        if (document.cookie.indexOf("aw_source=") < 0){
            _setCookie(sCookieName, "direct", iCookieLength);
        }