load more post on front-page template

Hi!

I’ve made a front-page template that displays my selected pages and the 3 latest posts on the same page. Also comments are forced showing on each post.
I want to be able to load the next 3 posts by clicking a button without reloading the page.
I know about the pbd-ajax-load-post plugin and the infinite-scroll plugin but can’t get those to work with my template.
Can someone please help me get this to work using the front-page template below?

<?php
/*
Template Name: Front
*/
get_header(); ?> 

<?php $args=array('orderby' =>'order','order' =>'asc','post_type' =>'page','post__in' => array(4,6,9,765)); $page_query = new WP_Query($args); ?>
<?php while ($page_query->have_posts()) : $page_query->the_post(); ?>

<section id="<?php echo $post->post_name;?>" class="post_page jumpAnchor"><a>">.</a>
<article class="container" id="<?php echo $post->post_name;?>_content">
<?php the_content(); ?>

</article><!--end article-->
</section><!--end section-->

<?php endwhile; ?>

<?php
$args = array( 'numberposts' => 3 );
$lastposts = get_posts( $args );
foreach($lastposts as $post) : setup_postdata($post); ?>
<section id="<?php echo $post->post_name;?>" class="post jumpAnchor"><a>">.</a>
<article class="container" id="<?php echo $post->post_name;?>_content">

<div class="post-meta">
<?php $categories = get_the_category(); $cat_slug = $categories[0]->slug; echo "<div class='post $cat_slug'>";   ?><?php foreach((get_the_category()) as $cat) { echo $cat->cat_name . ' '; } ?></div><p class="small">Skrivet den <?php the_time('j F, Y') ?> av <?php the_author_posts_link() ?></p>
</div><!-- .post-meta -->

<h3><?php the_title(); ?></h3>
<?php the_content(); ?>

<?php
$withcomments = 1; // force comments form and comments to show on front page
comments_template();
?>

</article><!--end article-->
</section><!--end section-->

<?php endforeach; ?>

<?php get_footer(); ?>

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