Calling comments_template() in the index.php

Below is what I have for my index.php file but for some reason it won’t pull the comments template. Any ideas?


<?php get_header(); ?>

<!--Begin Content-->

<div id="current_photo">

<?php if (have_posts()) : ?>

<?php while (have_posts()) : the_post(); ?>

<div class="photo" id="post-<?php the_ID(); ?>">
<?php the_excerpt(); ?>

</div><!--Close DIV.photo-->

</div><!--Close DIV#current_photo-->

<div id="ajax_info_comments">
<div id="info_comment_drawer" style="display:none;">

<div id="info">

<div class="post_meta_data">
<p class="posted_date">Posted on <?php the_date(); ?>
<p class="posted_categories">Filed Under | <strong><?php the_category('| '); ?></strong>

</div><!--Close DIV.post_meta_data-->

<div class="description">
<?php the_content(); ?>
</div>

</div><!--Close DIV#info-->

<div id="comments">
<?php comments_template(); ?>
</div>

</div><!--Close DIV#info_comment_drawer-->

<div class="pull_tab">
<a href="#bottom">info+comments</a>
</div><!--Close DIV.pull_tab-->

</div><!--Close DIV#ajax_info_comments-->

<?php endwhile; ?>

<?php else : ?>

<h2 class="center">Not Found</h2>
<p class="center">Sorry, but you are looking for something that isn't here.
<?php include (TEMPLATEPATH . "/searchform.php"); ?>

<?php endif; ?>

<?php get_footer(); ?>