External menu to twenty ten

I am trying to import a menu into the header php in twenty ten

<link href="http://www.foylecycling.net/p7pmm/p7PMMh02.css" rel="stylesheet" type="text/css" media="all" />
<script type="text/javascript" src="http://www.foylecycling.net/p7pmm/p7PMMscripts.js"></script></head>

then

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This works if it is one level but not for drop down (if i change the depth to 2 the drop downs appear on the page constantly) I think i should be using the following line of code from the original twenty ten code but i’m not sure how to make it work for my external files

<?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary' ) ); ?>

Can anyone help