infinite scroll in wordpress not working

<?php get_header(); ?>
<?php
if ($_GET['cat'] == NULL) {
    $crecurcat = "9";
    } else { $crecurcat = $_GET['cat']; }
 ?>


<div id="pagecontent">
<div id="crenav">

<h1><a href="?cat=" rel="bookmark">All</a></h1>

<?php $wpgleftposts = new WP_Query('category_name=credits&orderby=id&order=asc&posts_per_page=1'); ?>
               <?php while ($wpgleftposts->have_posts()) : $wpgleftposts->the_post(); ?>

<?php $curpid = $post->ID; ?>

               <?php endwhile; ?>




<?php
$parentCatName = single_cat_title('',false);
$parentCatID = get_cat_ID($parentCatName);
$childCats = get_categories( 'child_of='.$parentCatID );

if(is_array($childCats)):
foreach($childCats as $child){ ?>
<?php $childcatid = get_cat_ID($child->name); ?>
<h1><a href="?cat=<?php echo $childcatid; ?>" rel="bookmark"  <?php if ($crecurcat == $childcatid){echo 'class = "current"';} ?>  title="Permanent Link to <?php the_title_attribute(); ?>"><?php echo $child->name; ?></a></h1>
<?php }
endif;
?>


</div>
<div id="crepost">
 <?php if (have_posts()) : ?>

 <?php query_posts( array(
     'cat' => $crecurcat,
     'orderby' => 'id',
     'order' => 'asc',
));
?>

  <?php //$creloop = new WP_Query('category_name=credits&orderby=id&order=asc&paged=$paged'); ?>
               <?php while (have_posts()) : the_post(); ?>
<div class="crepostbox">
<div class="crebcon"><h1><?php the_title(); ?></h1></div>
<?php  the_post_thumbnail('full'); ?>
</div>
               <?php endwhile; ?>






     <?php endif; ?>
</div>
</div>


<?php get_footer(); ?>