Retrieving post images from wordpress - php

Question

my problem is that this code below retrieve images as attachments only for first four posts. For others it retrieves only post title. And each end every post is equal and stored same way in database and in backend of a wordpress site. And it retrieves first four and image of I think 16th post.
$myposts = get_posts(array(
'category' => $_POST["kategorija"],
'post_type' => 'post',
'posts_per_page' => -1
)
);
?>
<ul>
<?php
foreach ( $myposts as $post ) : setup_postdata( $post );
$title = $post->post_title;
$date = $post->post_date;
$content = $post->post_content;
$status = $post->post_status;
?>
<li>
<?php
$args = array(
'post_type' => 'attachment',
'numberposts' => -1,
'post_status' => null,
'post_parent' => $post->ID
);
$attachments = get_posts( $args );
if ( $attachments ) {
foreach ( $attachments as $attachment ) {
echo wp_get_attachment_image( $attachment->ID, 'thumbnail' );
}
}
?>
<h2><?php echo $title; ?> </h2>
<form enctype="multipart/form-data" action="oglas.php" method="POST">
<input type="hidden" name="idKategorije" value="<?php echo $post->ID; ?>" />
<input type="submit" value="selektuj" />
</form>
</li>
<?php
endforeach; ?>
</ul>

Answer 1

Well since you already get the posts in your first get_posts, I don;t see why you need another one.
This is from this page in the Codex:
====
Show attachments for the current post[edit]
Do this inside The Loop (where $post->ID is available).
<?php
$args = array( 'post_type' => 'attachment', 'posts_per_page' => -1, 'post_status' =>'any', 'post_parent' => $post->ID );
$attachments = get_posts( $args );
if ( $attachments ) {
foreach ( $attachments as $attachment ) {
echo apply_filters( 'the_title' , $attachment->post_title );
the_attachment_link( $attachment->ID , false );
}
}
?>