Outside of Loop Navigation Questions

I’m using the following code,

<?php $posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post(); ?>

	<?php previous_post_link(); ?> | <?php next_post_link(); ?>

<?php endwhile; endif; ?>

And although the links come up, the “<<” and “>>” next to the links are linked up. How do I make them links as well?

Thank you