Help me structure of controller and view in smarty

[eluser]ryantran[/eluser]
I use smarty in codeigniter.
My layout has a sidebar (file : sidebar.tpl) which contains some forms.
This sidebar will be embeded in many page (eg: home, news, tutorial...)
I want to construct those forms in controller before show to view.
How i should construct files for my need ?
Plz help me ! Thanks !