Show only Miniature.

Hi, I nedd Show only Miniature in my website, without description.

my website: http://peliculasonlinelatino.vv.si

Function:

# Displays post image attachment (sizes: thumbnail, medium, full)
function dp_attachment_image($postid=0, $size='thumbnail', $attributes='')
{
 if ($postid<1)
  $postid = get_the_ID();
 if ($images = get_children(array(
        'post_parent' => $postid,
        'post_type' => 'attachment',
        'numberposts' => 1,
        'post_mime_type' => 'image',))) 

 foreach($images as $image)
 {
  $attachment=wp_get_attachment_image_src($image->ID, $size);
 }
 else 

  ?>
<img src="<?php echo $attachment[0]; ?>" <?php echo $attributes; ?> >
<?php
}

Loop:

<div class="topContent"><?php
    dp_attachment_image($post->ID,'thumbnail','width="120px"',
       1,'<div class="post-thumbnail">','</div>',-1);
  the_content('(continue reading...)'); ?>
   </div>

Thanks.