sudden trouble with prev/next links

My index page used to display prev/next links at the bottom, but suddenly they aren’t showing, even though they’re in the code.

Code looks like this:

<?php the_content(); ?><br />

<?php endwhile; ?>

<p class="nav"><span class="prev"><?php posts_nav_link( '', '', __('« Previous Entries','bnTiny') ) ?></span>

	<span class="next"><?php posts_nav_link( '', __('Next Entries »','bnTiny'), '' ) ?></span></p>

<?php else: ?>

	<p><?php _e('Sorry, nothing found.','bnTiny'); ?></p>

<?php endif; ?>

<?php

}

get_footer(); ?>

Site is here.