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              <script src="http://cdn.extendjs.org/0.2.3/extend.min.js"></script>
              //Define MyClass
var MyClass = Class.extend(function(){
    this.constructor = function(){
        //Output from original class constructor
        console.log("MyClass constructor")
//MyOtherClass extends MyClass
var MyOtherClass = MyClass.extend(function(){
    this.constructor = function(){
        //Execute the constructor of the class we extended.
        //Output from extending class
        console.log("MyOtherClass constructor")
//Create instance of MyOtherClass
var instance1 = new MyOtherClass()
//=> "MyClass constructor"
//=> "MyOtherClass constructor"  
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