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(function(glob, app, undef) {
if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== 'function') {
      // closest thing possible to the ECMAScript 5
      // internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
        fToBind = this,
        fNOP    = function() {},
        fBound  = function() {
          return fToBind.apply(this instanceof fNOP
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    if (this.prototype) {
      // Function.prototype doesn't have a prototype property
      fNOP.prototype = this.prototype;
    }
    fBound.prototype = new fNOP();

    return fBound;
  };
}
  /**
   * @class b
   * @static
   */
  var pub = {};
  pub._setup = null;
  pub._draw = null;
  var init = function() {
    glob.b = pub;
    // -- init internal state vars --
  };
  var runSetup = function() {
    app.doScript(function() {
      if (typeof pub._setup === 'function') {
        pub._setup();
      }
    }, ScriptLanguage.javascript, undef, UndoModes.ENTIRE_SCRIPT);
  };
  var runDrawOnce = function() {
    app.doScript(function() {
      if (typeof pub._draw === 'function') {
        pub._draw();
      }
    }, ScriptLanguage.javascript, undef, UndoModes.ENTIRE_SCRIPT);
  };
  pub.foo = function(){
          $.writeln('hello new function');
        };
  pub.go = function() {
    try {
      if (typeof glob.setup === 'function') {

        pub._setup = glob.setup;
        pub._setup.foo =  this.foo;
        runSetup();
      };
      if (typeof glob.draw === 'function') {
        pub._draw = glob.draw;

        runDrawOnce();
      };
    } catch (e) {
      alert(e);
      exit();
    }
  };

  init();
})(this, app);

function setup() {
  $.writeln('setup');
  foo();
}

function draw() {
  $.writeln('draw');
}
b.go();