Multiple Post Thumbnails Plugin

I am having problems getting this plugin to run but have had little success getting it to work, even after reading past entries.

I have activated the plugin and placed the following code into the functions template to register multiple images:

// Add secondary thumbnail (featured image) in posts */
	if (class_exists('MultiPostThumbnails')) { new MultiPostThumbnails(array( 'label' =>
	'Secondary Image', 'id' => 'secondary-image', 'post_type' => 'post'
	));
	 add_image_size('post-secondary-image-thumbnail', 176, 58, true);

	new MultiPostThumbnails(array(
    'label' => 'Tertiary Image',
    'id' => 'tertiary-image',
    ));
	add_image_size('post-tertiary-image-thumbnail', 176, 58, true);

	new MultiPostThumbnails(array(
    'label' => 'Quaternary Image',
    'id' => 'quaternary-image',
    ));
	add_image_size('post-quaternary-image-thumbnail', 176, 58, true);
	}

I have then used the following code in the relevant template (I have posted the whole template code as I think you will need to see it in full):

<?php

	/*
		Template Name: Home
	*/

?>
<?php get_header(); ?>

<div id='main-content'>

            <h2>What We Do</h2>

            <ul id="we-do">

		<?php query_posts("posts_per_page=1&post_type=page&page_id=168"); the_post(); ?>
            <!--If you want to refer to the child of parent page, use "post_parent=" -->
            <li>
                <h3><?php the_title(); ?></h3>
                 <?php the_excerpt(); ?>
                 <?php if (class_exists('MultiPostThumbnails')
    && MultiPostThumbnails::has_post_thumbnail('post', 'secondary-image')) :
        MultiPostThumbnails::the_post_thumbnail('post', 'secondary-image'); endif; ?>
                <a href="<?php the_permalink(); ?>" class="button">View More</a>
            </li>

        <?php query_posts("posts_per_page=1&post_type=page&page_id=236"); the_post(); ?>

            <li>
                <h3><?php the_title(); ?></h3>
                <p><?php the_excerpt(); ?></p>
				<?php if (class_exists('MultiPostThumbnails')
    && MultiPostThumbnails::has_post_thumbnail('post', 'tertiary-image')) :
        MultiPostThumbnails::the_post_thumbnail('post', 'tertiary-image'); endif; ?>
                <a href="<?php the_permalink(); ?>" class="button">View More</a>
           </li>

      <?php query_posts("posts_per_page=1&post_type=page&page_id=240"); the_post(); ?>

            <li>    

                <h3><?php the_title(); ?></h3>
               	<?php the_excerpt(); ?>
                 <?php if (class_exists('MultiPostThumbnails')
    && MultiPostThumbnails::has_post_thumbnail('post', 'quaternary-image')) :
        MultiPostThumbnails::the_post_thumbnail('post', 'quaternary-image'); endif; ?>
                <a href="<?php the_permalink(); ?>" class="button">View More</a>
          </li>
             </ul>

</div><!--END main-content-->

<?php get_sidebar(); ?>

<?php get_footer(); ?>

I also want apply a class to the images but not sure where to place the array.

It might be important to note that I am also running the Featured Image functionality which is also registered in the functions template.