code: function (scriptLocation, callback) {
  		// We cannot assume that Assets class from mootools-more is available so instead insert a script tag to download script.
  		var head = doc.getElementsByTagName('head')[0];
  		var script = doc.createElement('script');
  
  		script.type = 'text/javascript';
  		script.src = scriptLocation;
  		script.onload = callback;
  
  		head.appendChild(script);
  	}
docs: Downloads a script and executes a callback when done.
  @param {String} scriptLocation
  @param {Function} callback