Wordpress - Have different Menus for Logged In users

wphack1.php

<?php
	//This is the normal wordpress menu code
	wp_nav_menu( array(
	'theme_location' => 'primary',
	'menu_class'     => 'primary-menu',
	'menu_id'        => 'primary-menu',
	'container'      => false 
	) );
?>

<?php
	//This is the new code, where *MAIN* and *MAIN_ADMIN* are menu names
	if (  is_user_logged_in() ) {
	wp_nav_menu( array( 'menu' => 'MAIN_ADMIN' ) );
	} else {
	wp_nav_menu( array( 'menu' => 'MAIN' ) );
	}
?>