Help in include files

[eluser]khuram[/eluser]
There is only one thing that i havent been able to understand.
Lets say on my template page, I have to load a list of categories in a table.

Ideally there should be a controller for template which can be called from anyother control to initialize the stuff.
I havent been able to find this out anywhere.
Right now, I am having to do this in every new page that I make.

Code:

$this->load->model('template/template','TemplateFunctions', TRUE);
$data['cats'] = $this->TemplateFunctions->get_categories();
$this->load->view('template/template', $data);

Ideally this is not the best situation. Please advice me into how to make a master control which I include in every control and it knows how to react.