Method inheritance from base class called from sub classes and switching context

gistfile1.txt

//Main Class
//Create base div class
function Div(){
  this.color = null;
  this.htmlElement = null;
  this.draw = function (){
    this.htmlElement = $("<div>"+this.color+"</div>");
    $('body').append(this.htmlElement);
  };
}


//Create sub classes
function RedDiv(){
  Div.call(this);
  this.baseClassDraw = this.draw;
  this.color = "#FF0000";
}

RedDiv.prototype = new Div();

RedDiv.prototype.draw = function(){
  this.baseClassDraw.call(this);
};

function BlueDiv(){
  Div.call(this);
  this.baseClassDraw = this.draw;
  this.color = "#0000FF";
}

BlueDiv.prototype = new Div();

BlueDiv.prototype.draw = function(){
  this.baseClassDraw.call(this);
};

//Create an instance to proove it works
$( document ).ready(function (){
  var newredDiv = new RedDiv();
  var newblueDiv  = new BlueDiv();
  newredDiv.draw();
  newblueDiv.draw();
});