Snake Doctor

For some reason I can't get the "NEXT PAGE" "PREVIOUS PAGE" links to show up on any of my blogs.

I've tried <?php wp_link_pages(); ?>
and
<div align="center" class="center">
<?php posts_nav_link('&nbsp;|&nbsp;', __('<strong>&laquo; Previous Page</strong>'), __('<strong>Next Page &raquo;</strong>')); ?>
</div>

But nothing shows up on the page, not even an error.
I'm using version 2.7



plskthx

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