injectballmod.js

var jq = document.createElement('script');
jq.src = '//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(jq);
var b, engine;
jq.onload = function () {
  var ballscript = document.createElement('script');
  ballscript.src = 'https://rawgit.com/austinpray/pro-grid-utils/master/ball_mod.js';
  document.getElementsByTagName('head')[0].appendChild(ballscript);
  ballscript.onload = function () {
    b = new ball();
    engine = new ballEngine(b);
  }
}