code: public Scriptable newObject(Scriptable scope, String constructorName)
      {
          return newObject(scope, constructorName, ScriptRuntime.emptyArgs);
      }
docs: Create a new JavaScript object by executing the named constructor.
  
  The call <code>newObject(scope, "Foo")</code> is equivalent to
  evaluating "new Foo()".
  
  @param scope the scope to search for the constructor and to evaluate against
  @param constructorName the name of the constructor to call
  @return the new object