Load a function when after the controller

[eluser]Emanuel01[/eluser]
Hello ,
I want to make a header - footer system and i`ve make this little plan :
I will extend my controllers with a MY_Controller library where i have 2 function : header that will be used before the controller and footer that need to be used after the controller .
Now i don`t know how to make the footer to be executed after the controller . Maybe with the php function __destruct ?
P.S. i don`t want to write at the end of every controller the function maybe exist another solution

Thx for the help and sorry for my english .