jQuery: Add jQuery Dynamically

gistfile1.txt

var jQueryReady = function($) {

  // Your code goes here...
  console.log('jQuery Ready!');
};

// Make sure jQuery is ready.
if (typeof jQuery == 'undefined') {
  var protocol = window.location.protocol;
  if (protocol.charAt(protocol.length - 1) == ':') {
    protocol = protocol.substring(0, protocol.length - 1);
  }
  var tag = document.createElement('script');
  var src = protocol;
  src += '://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js';
  tag.src = src;
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
  setTimeout(function tryAgain() {
    if (typeof jQuery == 'undefined') {
      setTimeout(tryAgain, 200);
    }
    else {
      jQueryReady(jQuery);
    }
  }, 200);
}