Comment Author Link in New Window

I was wondering if someone with better PHP-fu than me could help me craft a filter for functions.php to alter get_comment_author_link to open in a new window?

My (likely horrible) best guess follows:

function get_comment_author_link_new() {

	$url = get_comment_author_url();
	$author = get_comment_author();

	if (empty( $url ) || 'http://' == $url)

		$return = $author;

	else

		$return = "<a href='$url' rel='external nofollow' class='url' target='_blank'>$author</a>";

	return apply_filters('get_comment_author_link_new', $return);

}

add_filter('get_comment_author_link', 'get_comment_author_link_new');