Change login WP logo

It would be useful and unique if we could replace the WP logo on the login page. I use this code:
function custom_login_logo() {
echo ‘<style type=”text/css”>
h1 a { background-image:url(http://mysite.com/newlogo.jpg) !important; }
body { background: #fff !important; }
</style>’;
}
add_action(‘login_head’, ‘custom_login_logo’, ‘body’);