<?php
/*
Plugin Name: No Howdy
Plugin URI: http://planetozh.com/blog/my-projects/no-howdy-a-plugin-for-wordpress/
Description: Don't like <em>Howdy</em>? Change.
Author: Ozh
Version: 1.0
Author URI: http://planetozh.com/blog/
*/

// Customize:
$nohowdy = "Bonjour";

// Hook in
if (is_admin()) {
    add_action('init', 'ozh_nohowdy_h');
    add_action('admin_footer', 'ozh_nohowdy_f');
}

// Load jQuery
function ozh_nohowdy_h() {
    wp_enqueue_script('jquery');
}

// Modify
function ozh_nohowdy_f() {
global $nohowdy;
echo <<<JS
<script type="text/javascript">
//<![CDATA[
var nohowdy = "$nohowdy";
jQuery('#user_info p')
    .html(
    jQuery('#user_info p')
        .html()
        .replace(/Howdy/,nohowdy)
    );
//]]>
JS;
}

?>