Javascript OO pattern and inheritance

gistfile1.js

function isGlobal(other) {
	return (function() { return this == other; })();
}


function inherit(object, superclass) {
	
	if (superclass instanceof Function) {
		
		if (arguments.length > 2) {
			var param = Array.prototype.slice.call(arguments, 2);
		} else {
			var param = [];
		}

		superclass.apply(object, param);
	}

	return object;
}


function Person(name, famillyname) {

	if (isGlobal(this))
		return new Person(name, famillyname);

	var self = this;


	self.name = name;
        self.famillyname = famillyname;


	self.getName = function() {
		return self.famillyname + ", " + self.name;
	};

}


Person.prettyPrint = function(person) {
	console.log("Name: " + person.name);
	console.log("Familly Name: " + person.famillyname);
	console.log("");
};


function Employee(name, famillyname, boss) {

	if (isGlobal(this))
		return new Employee(name, famillyname, boss);

	var self = inherit(this, Person, name, famillyname);


	var __boss = boss;


	self.getBoss = function() {
		return __boss;
	}

	self.setBoss = function(boss) {
		__boss = boss;
	}

}