get_attachments( $instance );
foreach( $attachments as $attachment ){
$url = add_query_arg( array(
'w' => self::THUMB_SIZE,
'h' => self::THUMB_SIZE,
'crop' => 'true'
), wp_get_attachment_url( $attachment->ID ) );
?>
; ?> "<?php echo esc_attr( $attachment->post_title ); ?>")
>