Haze - Portfolio Page as Masonry

<?php
/*

Template Name: Portfolio Gallery

 */
?>
<?php get_header(); ?>

        <section class="page-title">
            <div class="double-separator"></div>
            <div class="breadcrumbs">
                <div class="one-half align-left">
                    <?php if (function_exists('dt_breadcrumbs')) dt_breadcrumbs(); ?>
                </div>

                <div class="one-half column-last align-right">
                <?php
                //get meta
                    $tagline = get_post_meta($post->ID, 'haze_tagline', TRUE);
                    if(!empty($tagline)) {  echo $tagline; }
                ?>
                </div>
            </div><!--end breadcrumbs-->
            <div class="double-separator"></div>
        </section>
    </div><!--end top-->

    <div class="centered-wrapper">

        <section id="portfolio-gallery">

            <?php
            if(!empty($data['no_filter_portfolio'])) {
                $portfolio_posts_per_page =  $data['no_filter_portfolio'];
            }
            else {
                $portfolio_posts_per_page = 12;
                }

                //get post type - portfolio
                query_posts(array(
                    'post_type'=>'portfolio',
                    'posts_per_page' => -1,
                    'paged' => $paged
                ));
            ?>
            <div class="portfolio-gallery-items <?php if($data['portfolio_cols']) echo strtolower($data['portfolio_cols']); ?>-columns">

                <?php if (have_posts()) : while (have_posts()) : the_post(); ?>

                <div class="portfolio-item">
                    <div class="rollover"></div>
                    <?php   // Check if wordpress supports featured images, and if so output the thumbnail
                    if ( (function_exists('has_post_thumbnail')) && (has_post_thumbnail()) ) :

                        // Output the featured image ?>
                        <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('portfolio-gallery-thumb'); ?></a>

                    <?php endif; ?>
                </div>

                <?php endwhile; endif; // END the Wordpress Loop ?>
            </div>

                <?php wp_reset_query(); // Reset the Query Loop ?>

        </section>

    </div><!--end centered-wrapper-->

<?php get_footer(); ?>