Captora Tracking Tag which loads jQuery when necessary

gtm.captora.html

<!-- Captora -->
<script>
/**
 * initialize Captora
 * requires jQuery, so load jQuery if not present
 */
(function initCaptora () {

    "use strict";

    var jQueryUrl;

    jQueryUrl = "https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.12.4.min.js";

    /**
     * getScript
     * @param {String} url The url of the script to get
     * @param {Function} callback The function to call when the script is loaded
     * @return {undefined}
     */
    function getScript (url, callback) {

        var done, firstScriptTag, isLoaded, script;

        done = false;
        script = document.createElement("script");
        script.async = true;
        script.src = url;
        if (typeof callback === "function") {

            script.onload = script.onreadystatechange = function handleLoad () {

                isLoaded = this.readyState.match(/^(loaded|complete)$/);
                if (!done && (!this.readyState || isLoaded)) {

                    done = true;
                    callback();

                    return;

                }

            };

        }
        firstScriptTag = document.getElementsByTagName("script")[0];
        firstScriptTag.parentNode.insertBefore(script, firstScriptTag);

    }

    if (window.jQuery) {

        getScript("https://cdn.captora.com/js/track.js");

    } else {

        getScript(jQueryUrl, function jQueryLoaded () {

            if (window.jQuery) {

                getScript("https://cdn.captora.com/js/track.js");

            } else {

                if (window.console) {

                    console.warn("Unable to load Captora tracking script because jQuery is not available.");

                }

            }

        });

    }

}());
</script>
<!-- End Captora -->