A callable version of the Google Adwords conversion script that doesn't use document.write

google_conversion

window.google_conversion_function = function () {
    var g = this;
    var h = parseFloat("0.06"),
        k = isNaN(h) || 1 < h || 0 > h ? 0 : h;
    var l = function (a, c) {
        for (var d in a) Object.prototype.hasOwnProperty.call(a, d) && c.call(null, a[d], d, a)
    };
    var m, n, p, q, r = function () {
            return g.navigator ? g.navigator.userAgent : null
        };
    q = p = n = m = !1;
    var s;
    if (s = r()) {
        var t = g.navigator;
        m = 0 == s.lastIndexOf("Opera", 0);
        n = !m && (-1 != s.indexOf("MSIE") || -1 != s.indexOf("Trident"));
        p = !m && -1 != s.indexOf("WebKit");
        q = !m && !p && !n && "Gecko" == t.product
    }
    var u = n,
        v = q,
        w = p;
    var x;
    if (m && g.opera) {
        var y = g.opera.version;
        "function" == typeof y && y()
    } else v ? x = /rv\:([^\);]+)(\)|;)/ : u ? x = /\b(?:MSIE|rv)[: ]([^\);]+)(\)|;)/ : w && (x = /WebKit\/(\S+)/), x && x.exec(r());
    var z = function (a) {
        this.b = [];
        this.a = {};
        for (var c = 0, d = arguments.length; c < d; ++c) this.a[arguments[c]] = ""
    }, C = function () {
            var a = A,
                c = "317150500 317150501 317150502 317150503 317150504 317150505".split(" ");
            if (a.a.hasOwnProperty(1) && "" == a.a[1]) {
                r: {
                    if (!(1E-4 > Math.random())) {
                        var d = Math.random();
                        if (d < k) {
                            try {
                                var b = new Uint16Array(1);
                                window.crypto.getRandomValues(b);
                                d = b[0] / 65536
                            } catch (e) {
                                d = Math.random()
                            }
                            c = c[Math.floor(d * c.length)];
                            break r
                        }
                    }
                    c = null
                }
                c && "" != c && a.a.hasOwnProperty(1) && (a.a[1] = c)
            }
        };
    z.prototype.c = function (a) {
        return this.a.hasOwnProperty(a) ? this.a[a] : ""
    };
    z.prototype.geil = z.prototype.c;
    var D = function () {
        var a = A,
            c = [];
        l(a.a, function (a) {
            "" != a && c.push(a)
        });
        return 0 < a.b.length && 0 < c.length ? a.b.join(",") + "," + c.join(",") : a.b.join(",") + c.join(",")
    };
    var A, E = "google_conversion_id google_conversion_format google_conversion_type google_conversion_order_id google_conversion_language google_conversion_value google_conversion_currency_code google_conversion_domain google_conversion_label google_conversion_color google_disable_viewthrough google_remarketing_only google_remarketing_for_search google_conversion_items google_custom_params google_conversion_date google_conversion_time google_conversion_js_version onload_callback opt_image_generator google_is_call google_conversion_page_url".split(" ");

    function F(a) {
        return null != a ? escape(a.toString()) : ""
    }

    function G(a) {
        return null != a ? a.toString().substring(0, 512) : ""
    }

    function H(a, c) {
        var d = F(c);
        if ("" != d) {
            var b = F(a);
            if ("" != b) return "&".concat(b, "=", d)
        }
        return ""
    }

    function I(a) {
        var c = typeof a;
        return null == a || "object" == c || "function" == c ? null : String(a).replace(/,/g, "\\,").replace(/;/g, "\\;").replace(/=/g, "\\=")
    }

    function J(a) {
        var c;
        if ((a = a.google_custom_params) && "object" == typeof a && "function" != typeof a.join) {
            var d = [];
            for (c in a)
                if (Object.prototype.hasOwnProperty.call(a, c)) {
                    var b = a[c];
                    if (b && "function" == typeof b.join) {
                        for (var e = [], f = 0; f < b.length; ++f) {
                            var B = I(b[f]);
                            null != B && e.push(B)
                        }
                        b = 0 == e.length ? null : e.join(",")
                    } else b = I(b);
                    (e = I(c)) && null != b && d.push(e + "=" + b)
                }
            c = d.join(";")
        } else c = "";
        return "" == c ? "" : "&".concat("data=", encodeURIComponent(c))
    }

    function K(a) {
        return "number" != typeof a && "string" != typeof a ? "" : F(a.toString())
    }

    function L(a) {
        if (!a) return "";
        a = a.google_conversion_items;
        if (!a) return "";
        for (var c = [], d = 0, b = a.length; d < b; d++) {
            var e = a[d],
                f = [];
            e && (f.push(K(e.value)), f.push(K(e.quantity)), f.push(K(e.item_id)), f.push(K(e.adwords_grouping)), f.push(K(e.sku)), c.push("(" + f.join("*") + ")"))
        }
        return 0 < c.length ? "&item=" + c.join("") : ""
    }

    function M(a, c, d) {
        var b = [];
        if (a) {
            var e = a.screen;
            e && (b.push(H("u_h", e.height)), b.push(H("u_w", e.width)), b.push(H("u_ah", e.availHeight)), b.push(H("u_aw", e.availWidth)), b.push(H("u_cd", e.colorDepth)));
            a.history && b.push(H("u_his", a.history.length))
        }
        d && "function" == typeof d.getTimezoneOffset && b.push(H("u_tz", -d.getTimezoneOffset()));
        c && ("function" == typeof c.javaEnabled && b.push(H("u_java", c.javaEnabled())), c.plugins && b.push(H("u_nplug", c.plugins.length)), c.mimeTypes && b.push(H("u_nmime", c.mimeTypes.length)));
        return b.join("")
    }

    function N(a, c, d) {
        var b = "";
        if (c) {
            var e;
            if (a.top == a) e = 0;
            else {
                var f = a.location.ancestorOrigins;
                if (f) e = f[f.length - 1] == a.location.origin ? 1 : 2;
                else {
                    f = a.top;
                    try {
                        e = !! f.location.href || "" === f.location.href
                    } catch (B) {
                        e = !1
                    }
                    e = e ? 1 : 2
                }
            }
            f = "";
            f = d ? d : 1 == e ? a.top.location.href : a.location.href;
            b += H("frm", e);
            b += H("url", G(f));
            b += H("ref", G(c.referrer))
        }
        return b
    }

    function O(a) {
        return a && a.location && a.location.protocol && "https:" == a.location.protocol.toString().toLowerCase() ? "https:" : "http:"
    }

    function P(a) {
        return a.google_remarketing_only ? "googleads.g.doubleclick.net" : a.google_conversion_domain || "www.googleadservices.com"
    }

    function Q(a, c, d, b) {
        var e = "/?";
        "landing" == b.google_conversion_type && (e = "/extclk?");
        var e = O(a) + "//" + P(b) + "/pagead/" + [b.google_remarketing_only ? "viewthroughconversion/" : "conversion/", F(b.google_conversion_id), e, "random=", F(b.google_conversion_time)].join(""),
            f;
        r: {
            f = b.google_conversion_language;
            if (null != f) {
                f = f.toString();
                if (2 == f.length) {
                    f = H("hl", f);
                    break r
                }
                if (5 == f.length) {
                    f = H("hl", f.substring(0, 2)) + H("gl", f.substring(3, 5));
                    break r
                }
            }
            f = ""
        }
        a = [H("cv", b.google_conversion_js_version), H("fst", b.google_conversion_first_time),
            H("num", b.google_conversion_snippets), H("fmt", b.google_conversion_format), H("value", b.google_conversion_value), H("currency_code", b.google_conversion_currency_code), H("label", b.google_conversion_label), H("oid", b.google_conversion_order_id), H("bg", b.google_conversion_color), f, H("guid", "ON"), H("disvt", b.google_disable_viewthrough), H("is_call", b.google_is_call), H("eid", D()), L(b), M(a, c, b.google_conversion_date), J(b), N(a, d, b.google_conversion_page_url), b.google_remarketing_for_search && !b.google_conversion_domain ?
            "&srr=n" : ""
        ].join("");
        return e + a
    }

    function R() {
        var a = S,
            c = document,
            d = T,
            b;
        b = O(a) + "//www.google.com/ads/user-lists/" + [F(d.google_conversion_id), "/?random=", Math.floor(1E9 * Math.random())].join("");
        return b += [H("label", d.google_conversion_label), H("fmt", "3"), N(a, c, d.google_conversion_page_url)].join("")
    }

    function U(a) {
        return {
            ar: 1,
            bg: 1,
            cs: 1,
            da: 1,
            de: 1,
            el: 1,
            en_AU: 1,
            en_US: 1,
            en_GB: 1,
            es: 1,
            et: 1,
            fi: 1,
            fr: 1,
            hi: 1,
            hr: 1,
            hu: 1,
            id: 1,
            is: 1,
            it: 1,
            iw: 1,
            ja: 1,
            ko: 1,
            lt: 1,
            nl: 1,
            no: 1,
            pl: 1,
            pt_BR: 1,
            pt_PT: 1,
            ro: 1,
            ru: 1,
            sk: 1,
            sl: 1,
            sr: 1,
            sv: 1,
            th: 1,
            tl: 1,
            tr: 1,
            vi: 1,
            zh_CN: 1,
            zh_TW: 1
        }[a] ? a + ".html" : "en_US.html"
    }

    function V() {
        var a = S,
            c = navigator,
            d = document,
            b = S;
        3 != b.google_conversion_format || b.google_remarketing_only || b.google_conversion_domain || A && C();
        var e = A ? A.c(1) : "",
            c = Q(a, c, d, b),
            d = function (a, b, c) {
                return '<img height="' + c + '" width="' + b + '" border="0" alt="" src="' + a + '" />'
            };
        return 0 == b.google_conversion_format && null == b.google_conversion_domain ? '<a href="' + (O(a) + "//services.google.com/sitestats/" + U(b.google_conversion_language) + "?cid=" + F(b.google_conversion_id)) + '" target="_blank">' + d(c, 135, 27) + "</a>" : 1 < b.google_conversion_snippets ||
            3 == b.google_conversion_format ? "317150501" == e || "317150502" == e || "317150503" == e || "317150504" == e || "317150505" == e ? d(c, 1, 1) + ('<script src="' + c.replace(/(&|\?)fmt=3(&|$)/, "$1fmt=4&adtest=on$2") + '">\x3c/script>') : d(c, 1, 1) : '<iframe name="google_conversion_frame" title="Google conversion frame" width="' + (2 == b.google_conversion_format ? 200 : 300) + '" height="' + (2 == b.google_conversion_format ? 26 : 13) + '" src="' + c + '" frameborder="0" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no">' +
            d(c.replace(/\?random=/, "?frame=0&random="), 1, 1) + "</iframe>"
    }

    function aa() {
        return new Image
    }

    function ba() {
        var a = T,
            c = R(),
            d = aa;
        "function" === typeof a.opt_image_generator && (d = a.opt_image_generator);
        a = d();
        c += H("async", "1");
        a.src = c;
        a.onload = function () {}
    };
    var S = window;
    if (S)
        if (null != /[\?&;]google_debug/.exec(document.URL)) {
            var ca = S,
                W = document.getElementsByTagName("head")[0];
            W || (W = document.createElement("head"), document.getElementsByTagName("html")[0].insertBefore(W, document.getElementsByTagName("body")[0]));
            var X = document.createElement("script");
            X.src = O(window) + "//" + P(ca) + "/pagead/conversion_debug_overlay.js";
            W.appendChild(X)
        } else {
            try {
                var Y;
                var Z = S;
                var _el_ = document.createElement('div');
                "landing" == Z.google_conversion_type || !Z.google_conversion_id || Z.google_remarketing_only && Z.google_disable_viewthrough ? Y = !1 : (Z.google_conversion_date = new Date, Z.google_conversion_time = Z.google_conversion_date.getTime(), Z.google_conversion_snippets = "number" == typeof Z.google_conversion_snippets && 0 < Z.google_conversion_snippets ? Z.google_conversion_snippets + 1 : 1, "number" != typeof Z.google_conversion_first_time && (Z.google_conversion_first_time = Z.google_conversion_time), Z.google_conversion_js_version = "7", 0 != Z.google_conversion_format && 1 != Z.google_conversion_format && 2 != Z.google_conversion_format && 3 != Z.google_conversion_format &&
                    (Z.google_conversion_format = 1), A = new z(1), Y = !0);
                _el_.innerHTML = V();
                // don't see how this will ever be truthy. that looks to be fine in our case
                if (Y && (document.querySelector('body').appendChild(_el_), S.google_remarketing_for_search && !S.google_conversion_domain)) {
                    var T = S;
                    ba()
                }
            } catch (da) {}
            for (var ea = S, $ = 0; $ < E.length; $++) ea[E[$]] = null
        };
};

Another option is to use the async version of the remarketing tag