Can't add a Home Page link

Im using the Thematic theme for a wordpress blog and would like to add a Home link in the menu bar. I’ve tried:

<php function childtheme_menu_args($args) {
$args = array(
'show_home' => 'Home',
'sort_column' => 'menu_order',
'menu_class' => 'menu',
'echo' => true
);
return $args;
}
add_filter('wp_page_menu_args','childtheme_menu_args');

?>

added this in the functions.php of my child theme, but it still ain’t working! This seems to be the only solution that is offered across the forum.

Any ideas? Any help would be greatly appreciated!