Class (instanceof Class)

function Class (ns) {
	this.toString = function () { return ns; };
}
Class.def = function (ns, ctx) {
	var c  = window;
	var ns = ns.split('.');
	for (var i = 0, ix = ns.length - 1; i < ix; i++)
		c = c[ns[i]] instanceof Object ? c[ns[i]] : c[ns[i]] = {};
 
	if (!(ctx.init instanceof Function)) ctx.init = function () {};
	c = c[ns[i]] = function () { this.constructor.apply(this, arguments); };
	c.prototype             = new Class(ns.join('.'));
	c.prototype.constructor = ctx.init;
	for (var key in ctx) if (ctx.hasOwnProperty(key)) {
		if (key != 'init') c.prototype[key] = ctx[key];
	}
 
	return c;
};