Adding previous/next post links

Thanks for replying. I tried pasteing the code:

<div class="navigation">
<div class="alignleft">
<?php previous_post('&laquo; &laquo; %',
 'Toward The Past: ', 'yes'); ?>
</div>
<div class="alignright">
<?php next_post('% &raquo; &raquo; ',
 'Toward The Future: ', 'yes'); ?>
</div>
</div> <!-- end navigation -->

into the “single.php”

Unfortunately it creates problems with formating for the post title. The title gets centered between the links.

I just want a simple previous post/next post navigation above the post title on a single post.

I also would like it to say the title, not “next” or “previous” or “toward the future” or anything like that.
Thanks for helping!