Loop for Slideshow

<div id="imagegallery">

<?php
        $featuredPosts = new WP_Query();
        $featuredPosts->query( array(
        'post_type' => array(
            'post_1',
            'post_2',
            'post_3',
        ),
        'posts_per_page' => 10
    ));
    ?>

    <?php if (have_posts()) :  $count = 0; ?>
    <?php while ($featuredPosts->have_posts()) : $featuredPosts->the_post();  ?>
        <?php $count++;
               if ($count == 1) {
        ?>
            <?php // Whatever want to display ?>
        <?php } else { ?>
                <span style="display:none;">
                <?php // Whatever want to display ?>
            </span>
        <?php } ?>
    <?php endwhile; endif; ?><!--/close loop-->

</div><!-- #imagegallery -->

<div id="prev"><img src="<?php bloginfo('stylesheet_directory');?>/images/left-arrow.jpg" /></div>
<div id="next"><img src="<?php bloginfo('stylesheet_directory');?>/images/right-arrow.jpg" /></div>