Infinite Scroll on a loop?

Hi there, I have a home page with four different loops (different category’s)

On one of the loops I want it to display five posts but also have the infinite scroll on it.

I have installed the infinite scroll plugin but for the life of me I can’t get it to work.

Here is my code for the loop.

<div class="row">
  <div class="span6 postscroll">
  <div id="postswrapper">
   <div class="item">
<br>
    <div class="row">
      <div class="span2">
        <a href="<?php the_permalink() ?>" rel="bookmark" title="<?php printf( esc_attr__( 'Permalink to %s', 'gabfire' ), the_title_attribute( 'echo=0' ) ); ?>" class="thumbnail">
        <?php $url = wp_get_attachment_url( get_post_thumbnail_id($post->ID, 'thumbnail') ); ?>
            <img src="<?php echo $url ?>" alt="">
        </a>
      </div>
      <div class="span4">
      <h4><strong><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php printf( esc_attr__( 'Permalink to %s', 'gabfire' ), the_title_attribute( 'echo=0' ) ); ?>"><?php the_title(); ?></a></strong></h4>
        <p>
<?php the_excerpt(); ?>
        </p>
        <p>
          <i class="icon-user"></i> by <?php echo get_the_author(); ?>
          | <i class="icon-calendar"></i> <?php the_date(); ?>
          | <i class="icon-tags"></i> Cat: <a href="<?php echo esc_url( $category_link ); ?>"><?php
$category = get_the_category();
echo $category[0]->cat_name;
?></a>

        </p>
      </div>
    </div>
<br>
</div>
</div>
  </div>
</div>
<hr>