replace slideshow_featured_posts
function from that tutorial with this:
function slideshow_featured_posts() {
$featured = 1; // Assuming that the name of the category ID number 1 is "Featured".
$count = 3; // How many post to be shown as slides. Ideally, it should be more than 3 posts.
add_filter('excerpt_length', 'hook_excerpt_featured_length');
$Silder_query = new WP_Query(array('cat' => $featured, 'posts_per_page' => $count));
?>
<div class="list">
<?php while ($Silder_query->have_posts()) : $Silder_query->the_post(); ?>
<div class="item">
<a class="image" href="https://wordpress.stackexchange.com/questions/23868/<?php the_permalink(); ?>" title="Permanent Link to <?php the_title_attribute(); ?>">
<?php the_post_thumbnail('slideshow'); ?>
</a>
<div class="meta">
<h3><a href="https://wordpress.stackexchange.com/questions/23868/<?php the_permalink(); ?>" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
<?php the_excerpt(); ?>
</div>
<div style="clear: both"></div>
</div>
<?php endwhile; ?>
</div>
<?php
wp_reset_query();
remove_filter('excerpt_length','hook_excerpt_featured_length');
}
everything else is ok.