Remove some TinyMCE buttons

<?php
/*
Plugin Name: zed1.com TinyMCE tweaks
Plugin URI: http://zed1.com/
Description: Remove some buttons from the visual editor
Author: Mike Little
Version: 0.0.1
Author URI: http://zed1.com/
*/

add_filter( 'mce_buttons', 'mce_buttons_remove_some' );
function mce_buttons_remove_some( $buttons ) {
    $buttons_to_remove = array( 'strikethrough', 'justifycenter' );
    return array_diff( $buttons, $buttons_to_remove);
}

add_filter( 'mce_buttons_2', 'mce_buttons_remove_some_2' );
function mce_buttons_remove_some_2( $buttons ) {
    $buttons_to_remove = array( 'justifyfull', 'forecolor' );
    return array_diff( $buttons, $buttons_to_remove);
}