WB 2.11.0

// loadScript - Loads a single Javascript file into the browser

// Arguments:

//    url - the address of the script file

//    callback - called when the script has been loaded

var loadScript = (function(url, callback) {

   if (callback == null) { callback = function() {}; }

//   var head = document.getElementsByTagName("head")[0];

   var body = document.getElementsByTagName("body")[0];

   var script = document.createElement("script");

   script.type = "text/javascript";

   script.addEventListener("load", function() {

      script.onLoad = null;

      callback(script);

   });

   script.onLoad = function () {};

   script.src = url;

//   head.appendChild(script);

   body.appendChild(script);

});