Add jQuery Slide Down Menu to Theme

hi there,
i’m not that new to wordpress, but new to customizing it that way..

what i’m trying to achieve is a menu for wordpress like this.
(tutorial)
just trying to add this to twentyten (of course i’ll have to change a few other things later) but it’s not working after all..

the menu should have this structure:

<ul id="sdt_menu" class="sdt_menu">
	<li>
		<a href="#">
			<img src="img1.jpg" alt=""/>
			<span class="sdt_active"></span>
			<span class="sdt_wrap">
				<span class="sdt_link">Link #1</span>
				<span class="sdt_descr">Description #2</span>
			</span>
		</a>
	</li>
	<li>
		<a href="#">
			<img src="img2.jpg" alt=""/>
			<span class="sdt_active"></span>
			<span class="sdt_wrap">
				<span class="sdt_link">Link #2</span>
				<span class="sdt_descr">Description #2</span>
			</span>
		</a>
		<div class="sdt_box">
				<a href="#">Sublink 2.1</a>
				<a href="#">Sublink 2.2</a>
				<a href="#">Sublink 2.3</a>
		</div>
	</li>
	</ul>

i have tried it this way:
<?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary', 'link_before'=>'<span class="sdt_active"></span><span class="sdt_wrap">', 'link_after'=>'</span>' ) ); ?>
the structure isn’t the way i want it to and it’s quite messed up.. ^^

so two questions:
1) how is it possible to achieve a structure like the one above? (i have managed to get the jquery script an css working though..)
2) maybe there is actually a theme/plugin that provides this kind of menu? unfortunately i havn’t found one yet.

thanks in advance! <3

greetings, chriz