need help for in attachment.php

Hello,
I created custom attachment.php

`<?php get_header(); ?>

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

<?php $attachment_link = get_the_attachment_link($post->ID, true, array());?>

<div class=”post” id=”post-<?php the_ID(); ?>”>

<div class=”entrytext”>
<p class=”<?php echo $classname; ?>”><?php echo $attachment_link; ?></p>
</div>

<?php endwhile; else: ?>

<p>Sorry, no attachments matched your criteria.</p>

<?php endif; ?>

</div>

<?php get_footer(); ?>`

I added $attachment_link; but its link to original file as well. can someone tell me the code to get full size attached image only that do not link to any where.

thanks