attached images outside loop?

hi – I’ve found this code that works, but how do I not show the images that appear in the post loop?
also if images are removed they still appear in the script, unless deleted from the media library – is there any way to fix this?

<?php
$args = array( 'post_type' => 'attachment', 'numberposts' => -1, 'post_mime_type' => 'image' ,'post_status' => null, 'post_parent' => $post->ID );
$attachments = get_posts($args);
if ($attachments) {
	foreach ( $attachments as $attachment ) { ?>
    <img src="<?php echo wp_get_attachment_url( $attachment->ID , false );  ?>" width="230" height="140" border="1" /></a>

<?php	}
}
?>