// Create an 'Animal' class by extending
// the 'Object' class with our magic method
var Animal = Object.extend(Object, {
    move : function() {alert('moving...');}
});

// Create a 'Dog' class that extends 'Animal'
var Dog = Object.extend(Animal, {
    bark : function() {alert('woof');}
});

// Instantiate Lassie
var lassie = new Dog();

// She can move and bark!
lassie.move();
lassie.bark();

// Create a namespace / module for your project
window.MyModule = {};

// Commence scope to prevent littering
// the window object with unwanted variables
(function() {

    var Animal = window.MyModule.Animal = Object.extend(Object, {
         move: function() {alert('moving...');}
    });

    // .. more code

})();

var Dog = Object.extend(Animal, {
     bark: function() {
         alert('woof');
     }
     // more methods ..
}).implement(Mammal, Carnivore);

// Instantiate object
var lassie = new Animal('Lassie');

// Register listener
lassie.on('eat', function(food) {
   this.food += food;
});

// Feed lassie by triggering listener
$('#feeding-button').click(function() {
    var food = prompt('How many food units should we give lassie?');
    lassie.trigger('eat', [food]);
    alert('Lassie has already eaten ' + lassie.food + ' units');
});

var Q = {};

Q.test = function(){};

if (!Q)
    var Q = {};

Q.myFunction = function(){};

if (Q.myFunction)
    Q.myFunction();
else
    // Use a different approach/method

var myInstance = {
  method1: function () {
    // ...
  },
  method2: function () {
    // ...
  }
};

$('#nav').click(function() {
   $(this).css('color','#f00').fadeOut();
});