index.php

<div class="navigation">
  <?php if(function_exists("wp_pagenavi")) : ?>
    <?php wp_pagenavi(); ?>
  <?php else : ?>
    <div class="alignleft"><?php next_posts_link('« Older Entries') ?></div>
    <div class="alignright"><?php previous_posts_link('Newer Entries »') ?></div>
  <?php endif; ?>
</div>