Object.prototype.attachClass = function(name, o){

    this[name] = function(){
        if(typeof(this.__init) == 'function'){
            this.__init.apply(this, arguments);
        }
    };

    var new_methods = {};
    for(var m in o){
        if(typeof(o[m]) == 'function'){
            eval('new_methods[m] = ' + o[m].toString().replace(') {', '){ var self = this;'));
        }
        else {
            new_methods[m] = o[m];
        }
    }

    this[name].prototype = new_methods;

}

var Global = {};
Global.attachClass('Person', {

    bodyType: 'alien',

    __init: function(opts){
        self.age = opts.age;
    },

    getAge: function(){

        // OMG, ALIENS ARE 10 TIMES OLDER THAN US!
        function verifyAge(age){
            if(self.bodyType == 'alien'){
                return Number(age) * 10;
            }
            return age;
        }

        return verifyAge(self.age);
    }

});

var p = new Global.Person({ age: 34 });
console.log(p.getAge());