Inheritance + super access in javascript

inherit.js

inherit = function(Child, Parent) {
    Child.prototype = new Parent();
    Child.prototype.constructor = Child;
    Child.prototype.super_ = function(methodName) {
        // Special case: calling from constructor
        if (arguments.caller.callee.prototype.super_) {
            return Parent.apply(this, arguments);
        }

        var varArgs = Array.prototype.slice.call(arguments, 1);
        return Parent.prototype[methodName].apply(this, varArgs);
    }
};