Simple namespace function

namespace.js

(function(global){

	global.namespace = function namespace(name, context) {
		var names = name.split('.'), name;
		context = context || global;
		while (name = names.shift()) {
			context = context[name] = context[name] || new function(){};
		}
		return context;
	};

}(this));

// using the context parameter
namespace('my.package', window);

my.package.Thing = function Thing(){};

namespace('more.namespacing', my.package);

my.package.more.namespacing.Thing = function Thing(){};