Classic "Holy Grail" inheritance pattern using an immediate function to store the proxy.

classic.js

var inherit = (function () {
    var proxy = function () {};
    return function (child, parent) {
        proxy.prototype = parent.prototype;
        child.prototype = new proxy();
        child._super = parent.prototype;
        child.prototype.constructor = child;
    }
}());

//example use
//inherit(Child, Parent);