Hello, I am having some trouble with the Wordpress "loop", specifically I am trying to insert it into my index.php file so it can call up my posts from Wordpress. I think I may be doing one or several things wrong here. When I put in this at the top:

< ?php   
require('./blog/wp-blog-header.php');   
?> 


and then this in the body:


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

<?php the_date('','<h2>','</h2>'); ?>

<div class="post" id="post-<?php the_ID(); ?>">
    <h3 class="storytitle"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h3>
   <div class="meta"><?php _e("Filed under:"); ?> <?php the_category(',') ?> &#8212; <?php the_tags(__('Tags: '), ', ', ' &#8212; '); ?> <?php the_author() ?> @ <?php the_time() ?> <?php edit_post_link(__('Edit This')); ?></div>

   <div class="storycontent">
      <?php the_content(__('(more...)')); ?>
   </div>

   <div class="feedback">
      <?php wp_link_pages(); ?>
      <?php comments_popup_link(__('Comments (0)'), __('Comments (1)'), __('Comments (%)')); ?>
   </div>

</div>

<?php comments_template(); // Get wp-comments.php template ?>

<?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
<?php endif; ?>


It gives me an error message:

Fatal error: Call to undefined function: have_posts() in /home/myID/public_html/index.php on line 170



does anyone have any idea about this? I'm sure many people do but I am a complete noob. Please help!!