preventing theme javascripts from loading on wp-login.php

I am having a problem after the most recent update to Version 3.3.1. I have the following code as part of my theme’s functions.php

function init_scripts() {

	$jsurl = get_bloginfo('template_directory') . '/js';

	wp_enqueue_script('jquery');

	if ( !is_admin() ) {
		wp_register_script(
			'formlabels',
			$jsurl . '/jquery.formlabels.js',
			array('jquery'),
			'1.0' );
		wp_register_script(
			'showhide',
			$jsurl . '/jquery.show-hide.js',
			array('jquery'),
			'1.0' );
		wp_enqueue_script('formlabels');
		wp_enqueue_script('showhide');
	}
}    

add_action('init', 'init_scripts');

In the past, this !is_admin() has prevented the two scripts from loading on the admin pages. Since the update, the scripts are now loading on wp-login.php, and the formlabels script is messing up the login form.

Suggestions to prevent these scripts from being enqueued on wp-login.php?