//js-core doesn't support bind, polyill taken from https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
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 || window,  
                               aArgs.concat(Array.prototype.slice.call(arguments)));  
        };  
  
    fNOP.prototype = this.prototype;  
    fBound.prototype = new fNOP();  
  
    return fBound;  
  };  
}