Include controller within controller

[eluser]variouspixels[/eluser]
I have a fairly simple website setup at present. My contacts page is more complicated than my other static pages and I have created a seperate form controller for this which works. How do I include my form controller into my contacts page? I know I can paste the code in from my other controller but I want to keep them separate.

Also, /form has a page of its own I do not want this form controller should only churn out a contacts_view.php include.

Noob here, I guess this is a simple question. Hope the question makes sense.

Code:

class Site extends Controller {

    function index() {
    $data = array();
        $data['title'] = 'Home';

        $this->load->view('header_view', $data);

        $data = array();
        $this->load->view('index_view', $data);

        $data = array();
        $this->load->view('footer_view', $data);
    }

    function about( // like above )...
    function events( // like above )...
    function services( // like above )...
    function contacts( // alot of code to paste in from my working controller. messy I want to keep separate controller )

}