function subClass() {
  this.inheritFrom = superClass;
  this.inheritFrom();
  this.bye = allBye;
  
  function allBye() {
	return "Bye from subClass";
  }
}

function superClass() {

  this.bye = allBye;
  this.hello = superHello;
  
  function superHello() {
    return "Hello from superClass";
  }
  
  function allBye() {
	return "Bye from superClass";
  }
  
}
var newClass = new subClass();

And the print function is:

function printMethod() {
  alert(newClass.bye());
  alert(newClass.hello());
}

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