dynamic load js

,loader

    <script>
        (function (undefined) {
            try {
                if (jQuery !== undefined) {
                    return;
                }
            } catch (e) {
                var body = document.getElementsByTagName('body')[0];
                var jqueryScript = document.createElement("script");
                console.log(jqueryScript);
                jqueryScript.src = '/Scripts/jquery-1.7.2.js';
                body.appendChild(jqueryScript);
                console.log(body);
            }
        })();
    </script>