jQuery.insert

if (!("jQuery" in window)) {
        console.info("jQuery ($) not defined");
        var k = document,
                c = k.createElement('script'),
                ref = k.getElementsByTagName('script')[0];
        c.type = "text/javascript";
        c.src = "http://code.jquery.com/jquery-1.9.1.min.js";
        c.onload = function () {
                console.warn("jQuery ($) defined");
        // code with jQuery
        }
        ref.parentNode.insertBefore(c, ref);
}