Inject jQuery and animate.css, then animate img elements

gistfile1.js

/*

Inject jQuery and animate.css into the current page and make the images bounce.

jQuery:         http://jquery.com/
animate.css:    https://daneden.github.io/animate.css/

Using https://cdnjs.com/ to source scripts.

*/

var jq = document.createElement('script');
jq.src = '//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(jq);
setTimeout(function() {
    jQuery.noConflict();
}, 5000);

link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
link.href = '//cdnjs.cloudflare.com/ajax/libs/animate.css/3.1.1/animate.min.css';
link.media = "all"
document.getElementsByTagName('head')[0].appendChild(link);

// This code borrowed from the animate.css demo page at https://daneden.github.io/animate.css/
function animate(selector, animation_name) {
    var classes = animation_name + ' animated';
    jQuery(selector)
        .removeClass(classes)
        .addClass(classes)
        .one('webkitAnimationEnd mozAnimationEnd MSAnimationEnd oanimationend animationend', function() {
            jQuery(this).removeClass(classes);
        });
};

animate('img', 'hinge');