Javascript: Chain the prototypes of Parent and Child functions

chainPrototypes.js

// Chain the prototypes of Parent and Child functions.
function chainPrototypes (Parent, Child) {

  // Create the link to Parent's prototype
  var ChildPrototype = function(){};
  ChildPrototype.prototype = Parent.prototype;
  Child.prototype = new ChildPrototype();

  // Setup the proper constructor for 'instances' of Child.
  Child.prototype.constructor = Child;

  // Return "super"
  return Parent.prototype;
}