sorting out messed up code for sub-menu

I was following the instructions from frosken (which were really great and helped someone do exactly what I wanted to do) in another forum post and now my menu is completely blank. I tried to restore it by copying in the code from file before I made the changes and it is still blank. Help!

Here is the code in my header.php file

<div id="menu">

<ul>
			<li class="current_page_item<?php if (is_home()) echo ' current_page_item'; ?>"><a>/" class="current_page_item">Home</a>
			<?php wp_list_pages('title_li=' ); ?>
		</ul>
</div>

I think I just need to do something with the <?php wp_list_pages(‘title_li=’ ); ?> bit to make child pages show up when you hover over the parent page in the menu.

Can someone point me in the right direction or troubleshoot this for me?

Thanks.