I'm trying to remove the thumbnails generated by the featured images within my posts. I'm using a theme that evidently supports this unwanted generation. I'm including the code from single.php that seems to be at the root of the problem for me. Any efforts on my part to tinker with it have only crashed the site. Please help!
if (have_posts()) :
while (have_posts()) : the_post();
$preview_image = kriesi_post_thumb($post->ID, array('size'=> array('M'),
'display_link' => array('lightbox'), // '_prev_image_link' or array('lightbox')
'linkurl' => array ('fullscreen','_preview_big'),
'wh' => $k_option['custom']['imgSize']['M']