Previous/ Next Link ?

This is what I have at the moment:

<h2>More Entries</h2>

<dl>
<dd><?php previous_post_link(‘Previous: %link’) ?></dd>
</dl>

<dl>
<dd><?php next_post_link(‘Next: %link’) ?></dd>
</dl>

But on my first post, it only shows the “next” link with a gap between the header and the link. How do I make that gap disappear when that link is not available?

I hope this make sense…