WordPress MU

I have a MU setup with multiple blogs and a subdomain for each of them

bloga.example.com
blogb.example.com
blogc.example.com
etc

now i have the following code drawing out a nav successfully on the top level page (example.com) but when i go to the sub domain all i get out of my loop is "uncategorized".

<?php
$blogs = get_blog_list( 0, 'all' );
 foreach( $blogs as $details ) {
		?><li class="cat_item"><a href="http://<?php echo $details[ 'domain' ] . $details[ 'path' ] ?>"><?php echo get_blog_option( $details[ 'blog_id' ], 'blogname' ) ?></a></li><?php
	}

	?>

what am i missing for the subdomains to draw out a full nav that shows all other blogs?

i've seen a few plugins that allow viewing this nav from the top level site, but not when drilling down.

In the sub-blog theme, place the call to blog 1 (main site) switch_to_blog(1) to get its navigation and after the place the restore_current_blog function to get back to your current blog

<?php switch_to_blog(1); ?>
//get what you need from the main site like main page nav
<?php wp_list_pages('title_li='); ?>
//restore back to current blog
<?php restore_current_blog(); ?>