// Get thumbnail
function get_thumb() {
$files = get_children('post_parent='.get_the_ID().'&post_type=attachment&post_mime_type=image');
  if($files) :
    $keys = array_reverse(array_keys($files));
    $j=0;
    $num = $keys[$j];
    $image=wp_get_attachment_image($num, 'large', false);
    $imagepieces = explode('"', $image);
    $imagepath = $imagepieces[1];
    $thumb=wp_get_attachment_thumb_url($num);
    print $thumb;
  endif;
}