Multiple Custom Menu not working share same links

I’m building a theme with WordPress 3.0.1 and i need to use multiple custom menu, using the built in new menu feature…

this is the code in my functions.php

add_action( 'init', 'register_my_menus' );

function register_my_menus() {
register_nav_menus(
array(
'primary_nav' => __( 'Primary Navigation' ),
'slider_nav' => __( 'Slider Navigation' ),
)
);
}
?>

Everything is working in my wp dashboard i can add and remove menu items and i can select wich menu i need to use in each different theme location.

Now, this is the code i’m using in my template for primary navigation and slider navigation

primary navigation

<?php wp_nav_menu( array('menu' =>'primary_nav','container'=>'','menu_class'=>'sf-menu','menu_id' =>'navbar')); ?>

and slider navigation

<?php wp_nav_menu( array('menu' =>'slider_nav','container'=>'','menu_class'=>'slider-wrapper','menu_id' =>'slider-navigation')); ?>

they both works, but they share the same links, if i add new links at the slider navigation they do not show, but if i add new links at the primary navigation they show in both primary and secondary navigation…

how can i fix this ?