function edit_admin_menu() {

    global $menu;
    $menu = array();

    $menu[10] = array (
        '0' => 'Startseite',
        '1' => 'read',
        '2' => 'index.php',
        '3' => '',
        '4' => 'menu-top menu-top-first menu-icon-dashboard',
        '5' => '',
        '6' => ''
    );

    $menu[20] = array (
        '0' => 'Design',
        '1' => 'switch_themes',
        '2' => 'themes.php',
        '3' => '',
        '4' => 'menu-top menu-icon-tools',
        '5' => '',
        '6' => ''
        );

    $menu[30] = array (
        '0' => 'Menüs',
        '1' => 'edit_theme_options',
        '2' => 'nav-menus.php',
        '3' => '',
        '4' => 'menu-top menu-icon-appearance',
        '5' => '',
        '6' => ''
        );

    # my 2nd try (same result)
    # add_menu_page('Menues', 'Menues', 'edit_theme_options', 'nav-menus.php', '', '', '');

}

add_action('admin_menu', 'edit_admin_menu');