I have this code... but need it to show the latest post not blog..

Hi I am using

<?php
$blogs = get_last_updated();
if( is_array( $blogs ) ) {
	?>
	<ul>
	<?php foreach( $blogs as $details ) {
		?><li><a href="http://<?php echo $details[ 'domain' ] . $details[ 'path' ] ?>"><?php echo get_blog_option( $details[ 'blog_id' ], 'blogname' ) ?></a></li><?php
	}
	?>
	</ul>
	<?php
}
?>

Code (markup):

which shows the latest blog that has been updated on a WPMU website.

I am not that good with php but what I would like is to show the latest POST from a different WPMU that is not the main blog.

so i would like this code to display the latest post from the blog in which it is currently displaying, thanks.