Formatting of custum nav-bar

Hi!

I have this navcode in my theme:

<nav class="art-nav">
    <?php
	echo theme_get_menu(array(
			'source' => theme_get_option('theme_menu_source'),
			'depth' => theme_get_option('theme_menu_depth'),
			'menu' => 'primary-menu',
			'class' => 'art-hmenu'
		)
	);
	get_sidebar('nav');
?> 

    </nav>

It works as is should, but I’m trying to add this code

<?php wp_nav_menu( array(
		'container' => 'none',
		'container_class' => 'menu-header',
		'theme_location' => 'primary',
		'menu' => get_post_meta( $post->ID, 'MenuName', true)
		)
	);
?>

to get custom menus. The code is working but I can’t figure out how to get it in the right format. ( same font / color etc )