Code:
function Person(firstName, lastName) {
        var _firstName = firstName;
        var _lastName = lastName;
        
        Person.prototype.__defineGetter__("firstName", function() {
           return _firstName; 
        });
        
        Person.prototype.__defineSetter__("firstName", function(value) {
            _firstName = value;
        });
        
        Person.prototype.__defineGetter__("lastName", function() {
            return _lastName;
        });
        
        Person.prototype.__defineSetter__("lastName", function(value) {
            _lastName = value;
        });
    };
    
    var p1 = new Person("John", "Doe");
    
    console.log(p1.firstName); // Prints John
    console.log(p1.lastName); // Prints Doe
    
    function Dignitary() {
        
    };
    
    Dignitary.prototype = new Person(); // making Dignitary inherit Person
    Dignitary.constructor = Dignitary; 
    
    var d1 = new Dignitary("Jane", "Bimbo");
    console.log(d1.firstName); // THIS IS COMING OUT UNDEFINED, WHAT AM I DOING WRONG?
Thanks in advance.