all images for a slider / http://revelationconcept.com/wordpress-display-all-post-attachment-images-in-a-slider/

gistfile1.php

<?php
function revconcept_get_images($post_id) {
    global $post;
 
     $thumbnail_ID = get_post_thumbnail_id();
 
     $images = get_children( array('post_parent' => $post_id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') );
 
     if ($images) :
 
         foreach ($images as $attachment_id => $image) :
 
         if ( $image->ID != $thumbnail_ID ) :
 
             $img_alt = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); //alt
             if ($img_alt == '') : $img_alt = $image->post_title; endif;
 
             $big_array = image_downsize( $image->ID, 'large' );
             $img_url = $big_array[0];
 
             echo '<li>';
             echo '<img src="';
             echo $img_url;
             echo '" alt="';
             echo $img_alt;
             echo '" />';
             echo '</li><!--end slide-->';
 
     endif; endforeach; endif; }
?>

http://rudrastyh.com/wordpress/slider-in-posts.html