Load scripts with JS

loader.js

// Load JS function
var loadJS = function(url, callback){
  var scriptTag = document.createElement('script');
  scriptTag.src = url;
  scriptTag.onload = callback;
  scriptTag.onreadystatechange = callback;
  document.body.appendChild(scriptTag);
};

// Load CSS function
var loadCSS = function(url) {
  var styleTag = document.createElement('link');
  styleTag.href = url;
  styleTag.rel = "stylesheet";
  styleTag.type= "text/css";
  document.head.appendChild(styleTag);
};

jQuery(document).ready(function() {
  // var protocol = location.protocol; (optional)
  loadJS('URL', <callback>);
  loadCSS('URL');
});