Simple Templating in CI

class Template
{
    private $theme = 'default';

    function set_theme($theme)
    {
        $this->theme = $theme;
    }

    function build($view, $data)
    {
        $this->load->view($this->theme.'/header', $data);
        $this->load->view($view, $data);
        $this->load->view($this->theme.'/footer', $data);
    }
}