Nivoslider Plugin -using all the post images in the cat setting

Hello,

Using the Nivo Slider plugin in ‘category’ more, the plugin currently only uses featured images from each post.

I was wondering how one might change the code below to use all the images from each post.

Any thoughts most gratefully received!

Ben

if($_POST['slider_type'] == 'category'){
$args = array(
'post_type' => 'post',
'numberposts' => -1,
'category' => $_POST['category']
);
$posts = get_posts( $args );
if( $posts ){
foreach( $posts as $post ){
if( has_post_thumbnail($post->ID) ) {
$image = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'thumbnail' );
$images[] = array(
'id' => get_post_thumbnail_id($post->ID),
'src' => $image[0]