Remove featured image from showing inside the post?

This is my code

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

<div id="content"> <!-- content -->
<div id="contentcopy"> <!-- copy -->
<span class="pagetitle"><strong><?php the_title(); ?></strong> &mdash; <a href="<?php bloginfo('url'); ?>" target="_self">Close</a></span><br /><br />
<span class="pagecontent"><?php the_content(); ?></span><br />

</div><!-- copy -->

<div id="imgcontent">
<?php my_attachment_gallery(0, 'large', 'alt="' . $post->post_title . '"'); ?>
</div>

<?php endwhile; // end of the loop. ?>

Its a custom theme but I can’t figure out how to remove the featured post. Im guessing to add some markup to the “php my_attachment_gallery” bit