How to add meta boxes to Pages

I’ve got this working finally ($template_file == ‘page-tjenester.php’), so now my meta boxes shows up only when I use this specific page-template!

This is the final code if someone is interesting;

add_action('admin_init','my_meta_init');
function my_meta_init()
{

$post_id = $_GET['post'] ? $_GET['post'] : $_POST['post_ID'] ;
$template_file = get_post_meta($post_id,'_wp_page_template',TRUE);

if ($template_file == 'page-tjenester.php') { // this will only show on pages that have been saved with the page-tjenester.php template

        add_meta_box('meta_webdesign', 'Webdesign', 'my_meta_webdesign', 'page', 'normal', 'high');
        add_meta_box('meta_grafisk', 'Grafisk design & Identitets design', 'my_meta_grafisk', 'page', 'normal', 'high');
        add_meta_box('meta_illustrasjon', 'Illustrasjon', 'my_meta_illustrasjon', 'page', 'normal', 'high');
    }
}

Not hard at all (not sure what I did wrong when I tried this before)

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