Force Main Menu

Update:
I have just seen that my theme does not natively support menus. IS there anyway to create top level null links?

Thanks for your response and that would be a good idea. I tried to follow the tutorial and the first part went Ok and indeed my theme’s message about not supporting menus disappears.

My problem is that I don’t seem to be able to get the right point in header.php for inserting the <?php wp_nav_menu( array( ‘theme_location’ => ‘header-menu’ ) ); ?> line.

I am summing that it should go in this area:

<div id="navbar">

	<div id="navbarleft">
		<strong><ul id="nav">

<li><a>">Home</a></li>
			<?php wp_list_pages('title_li=&depth=2&sort_column=menu_order&exclude=147,149,162'); ?>
		</strong>
	</div>
	<?
include_once("style.php");
?> <div id="navbarright">
		<a>"><img style="vertical-align:middle" src="<?php bloginfo('template_url'); ?>/images/rss.gif" alt="Subscribe to <?php bloginfo('name'); ?>" /></a><a>">News Feed</a>
	</div>

</div>

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I have put in in place of the lines I have highlighted, but when i view the page, the menu is just listed vertically.