bindPolyfill.js

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) {
			// native functions don't have a prototype
			fNOP.prototype = this.prototype;
		}
		fBound.prototype = new fNOP();

		return fBound;
	};
}