gistfile1.js

(function(){
  var newscript = document.createElement('script');
     newscript.type = 'text/javascript';
     newscript.async = true;
     newscript.src = '//ajax.googleapis.com/ajax/libs/jqueryui/1.10.1/jquery-ui.min.js';
  (document.getElementsByTagName('head')[0]||document.getElementsByTagName('body')[0]).appendChild(newscript);
})();