[DESIGN] same function in two controller

[eluser]Zulkifli Said[/eluser]
hi guys,
i have two controllers in my CI apps.

- admin_controller.php, and
- user_controller.php

in user_controller.php, there is a function show_message() like this:

Code:

class User_controller extends Controller{

function show_message(){
  echo "your message";
}

}

and, in admin_controller.php, i want to write a function like show_message().

my question, what is the best way to use one function in two controller?

- Is i rewrite function show_message in admin_controller.php like this ?

class Admin_controller extends Controller{

Code:

function show_message(){
  echo "your message";
}

}

or

- i create that funciton in file helper and call the funtion in controller admin and user??


thanks...