Customizing wp_nav_menu in Starkers Theme

Hi all,

I’m battling to find something here.. It’s probably right under my nose and I wouldn’t be surprised if I’ve already gone past it 20 times. Anyway, I’ll skip the long descriptions because I suspect this is something really simple.

First off, I’m assuming the menu is built through the default WP functions, so is there any way I can edit the structure of the output for my theme alone?

Currently, the theme has this:

<div role="navigation"><br />
	<?php /* Our navigation menu.  If one isn't filled out, wp_nav_menu falls back to wp_page_menu.  The menu assiged to the primary position is the one used.  If none is assigned, the menu with the lowest ID is used.  */ ?><br />
	<?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary' ) ); ?><br />
</div><!-- #mainnav -->

And it outputs:

<div role="navigation"><br />
	<div class="menu">
		<ul>
			<li class="current_page_item"><a href="https://127.0.0.1:8080/Amity/" title="Home">Home</a><br />
			<li class="page_item page-item-8"><a href="https://127.0.0.1:8080/Amity/?page_id=8" title="About Us">About Us</a><br />
			<li class="page_item page-item-2"><a href="https://127.0.0.1:8080/Amity/?page_id=2" title="Sample Page">Sample Page</a>
		</ul>
	</div><br />
</div><!-- #mainnav -->

And I want the output to be:

<div role="navigation">
	<ul id="mainnav" class="dropdown">
		<li class="current_page_item"><a href="https://127.0.0.1:8080/Amity/" title="Home">Home</a><br />
		<li class="page_item page-item-8"><a href="https://127.0.0.1:8080/Amity/?page_id=8" title="About Us">About Us</a><br />
		<li class="page_item page-item-2"><a href="https://127.0.0.1:8080/Amity/?page_id=2" title="Sample Page">Sample Page</a>
	</ul>
</div><!-- #mainnav -->

Problem is, I can’t find where the DIV with class ‘menu’ is being added to take it out or edit it.. Could someone help me out here?