Adding login/logout to thte menu

Hi,

In an attempt to add login/logout to my menu, I’ve added this code to my function.php

/* LogIn - LogOut */

add_filter('wp_nav_menu_items', 'add_login_logout_link', 10, 2);
function add_login_logout_link($items, $args) {

		ob_start();
		wp_loginout('index.php');
		$loginoutlink = ob_get_contents();
		ob_end_clean();

		$items .= '<li>'. $loginoutlink .'</li>';

	return $items;
}

/* LogIn - LogOut END */

My problem is, that the login/logout now appears in both the page menu as well as the category menu.

How do I make it appear only in the page menu?

Help greatly appreciated thank you,

Michael 🙂

(http://www.buildinganonline.com/)