Common methods for all controllers

[eluser]owidiuszek[/eluser]
Hello,

What is the best way to make few methods available to all controllers?

for example some result view:

Code:

function showResult($text, $state)
    {    
        $data['page'] = "result_view";
        $data['text'] = $text;
        $data['state'] = $state;
        $this->load->view('main', $data);
    }

And I would liek to access it from every controller in my app like:
$this->showResult('aaa','bbb'); (or similar)

without pasting this code inside each controller.

Should I create for example maincontroller and then extend all others basing on it?
Or maybe usage of library or helper would be better?