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(newDiv);
  }
}

Changed the locally scoped variable var newDiv to class attribute this.htmlElement. This stores a reference in your class to you actual HTML element that you created in the DOM.

OK, so the way this works is that instead of creating a newDiv var you instead want to create an attribute of the Div class, which is the this.htmlElement, and then I can use that attribute in other sub classes of Div?