// ES5 15.2.3.5
// http://es5.github.com/#x15.2.3.5
if (!Object.create) {

    // Contributed by Brandon Benvie, October, 2012
    var createEmpty;
    var supportsProto = Object.prototype.__proto__ === null;
    if (supportsProto || typeof document == 'undefined') {
        createEmpty = function () {
            return { "__proto__": null };
        };
    } else {
        // In old IE __proto__ can't be used to manually set `null`, nor does
        // any other method exist to make an object that inherits from nothing,
        // aside from Object.prototype itself. Instead, create a new global
        // object and *steal* its Object.prototype and strip it bare. This is
        // used as the prototype to create nullary objects.
        createEmpty = function () {
            var iframe = document.createElement('iframe');
            var parent = document.body || document.documentElement;
            iframe.style.display = 'none';
            parent.appendChild(iframe);
            iframe.src = 'javascript:';
            var empty = iframe.contentWindow.Object.prototype;
            parent.removeChild(iframe);
            iframe = null;
            delete empty.constructor;
            delete empty.hasOwnProperty;
            delete empty.propertyIsEnumerable;
            delete empty.isPrototypeOf;
            delete empty.toLocaleString;
            delete empty.toString;
            delete empty.valueOf;
            empty.__proto__ = null;

            function Empty() {}
            Empty.prototype = empty;
            // short-circuit future calls
            createEmpty = function () {
                return new Empty();
            };
            return new Empty();
        };
    }

    Object.create = function create(prototype, properties) {

        var object;
        function Type() {}  // An empty constructor.

        if (prototype === null) {
            object = createEmpty();
        } else {
            if (typeof prototype !== "object" && typeof prototype !== "function") {
                // In the native implementation `parent` can be `null`
                // OR *any* `instanceof Object`  (Object|Function|Array|RegExp|etc)
                // Use `typeof` tho, b/c in old IE, DOM elements are not `instanceof Object`
                // like they are in modern browsers. Using `Object.create` on DOM elements
                // is...err...probably inappropriate, but the native version allows for it.
                throw new TypeError("Object prototype may only be an Object or null"); // same msg as Chrome
            }
            Type.prototype = prototype;
            object = new Type();
            // IE has no built-in implementation of `Object.getPrototypeOf`
            // neither `__proto__`, but this manually setting `__proto__` will
            // guarantee that `Object.getPrototypeOf` will work as expected with
            // objects created using `Object.create`
            object.__proto__ = prototype;
        }

        if (properties !== void 0) {
            Object.defineProperties(object, properties);
        }

        return object;
    };
}