function superClass() {

  this.bye = superBye;
  this.hello = superHello;
  
  function superHello() {
    return "Hello from superClass";
  }
  
  function superBye() {
    return "Bye from superClass";
  }
}

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

The problem is that Netscape 4.04 on Mac does not like the bottom nesting. It is much happier when the function subBye() is defined at the top level of the script hierarchy, like this:

function superClass() {

  this.bye = superBye;
  this.hello = superHello;
  
  function superHello() {
    return "Hello from superClass";
  }
  
  function superBye() {
    return "Bye from superClass";
  }
}

function subClass() {
  this.inheritFrom = superClass;
  this.inheritFrom();
  this.bye = subBye;
  
  
}

function subBye() {
  return "Bye from subClass";
}

Click here to invoke the following script that activates these objects:

var newClass = new subClass();
function printSub() {
  alert(newClass.bye());
  alert(newClass.hello());
}

So, if Netscape 4.04 on Mac is important for you, it is better not to nest function defintions. When you cannot nest functions, limit yourself to unique functions all over. Use the method assignment syntax to use different functions, as shown above. We defined, for example, superClass' bye() method as superBye(), and subClass' bye() method as subBye().

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