Add_rewrite_rule doesn’t seem to work?

Question

ok this i didn’t know i had to “register” variable to use

function my_add_rewrite_rules() {
    global $wp,$wp_rewrite;
    $wp->add_query_var('book_id');
    add_rewrite_rule('^books/([^/]*)/reviews/([0-9]+)/?$', 'index.php?page_id=227&bookid_id=$matches[2]', 'top');
    // Once you get working, remove this next line
  $wp_rewrite->flush_rules(false);  

}
add_action('init', 'my_add_rewrite_rules');

and in page-reviews.php i am using

$book_id = $GLOBALS['wp']->query_vars['book_id'];

One last question: how do i fix my breadcrumbs as the books/…/reviews is not displayed in the breadcrumbs?