Show WP menu in header

Hi,

sorry for silly question, but i made wp menu like this:

/* Další menu */

function register_my_menus() {
  register_nav_menus(
    array( '1-hlavni' => __( '1. řádek hlavního menu' ), '2-hlavni' => __( '2. řádek hlavního menu' ))
  );
}

add_action( 'init', 'register_my_menus' );

In Admin I can work with it. But I don`t really know how to implement it to the template.

I tried this but it doesn`t work:

<?php wp_nav_menu( array('1-hlavni')); ?>

Thank you very much.