custom ajax slide query

function my_login_wpcategories(){
    global $wpdb;
    $slide = 1;
    $popup = 1;
    $ajax_content = '';

    $taxonomy = 'wpcategories';
    $parent_term = $_GET['term'];

    $parent_term_id = $wpdb->get_var("SELECT term_id FROM $wpdb->terms WHERE slug='$parent_term'");
    $child_term = get_term_children( $parent_term_id , $taxonomy );

    foreach($child_term as $term){

        if($slide==1 || $slide%3==1)
            $ajax_content .= '<div class="slide">';

        $term_data = get_term_by('id', $term, $taxonomy);
        $args = array(
            'post_type' => 'whitepaper',
            'tax_query' => array(
                array(
                    'taxonomy'  => $taxonomy,
                    'field'     => 'id',
                    'terms'     =>  $term
                )
            ),
            'posts_per_page' => -1
        );

        $tabpopup = $slidebase = '';
        $pop_i = 1;
        $my_post = new WP_Query($args);

        // .processitem
        $ajax_content .= '<div class="processitem">';

        if($my_post->have_posts()) :
            while ( $my_post->have_posts() ) : $my_post->the_post();
                if($pop_i<=5)
                    $tabpopup_content .= '<p><a href="'.get_permalink().'">'.get_the_title().'</a></p>';
                $pop_i++;
                $slidebase_content .= '<p><a href="'.get_permalink().'">'.get_the_title().'</a></p>';
            endwhile;

            $tabpopup .= '<div id="pop'.str_pad( $popup, 2, 0, STR_PAD_LEFT ).'" class="tabpopup" style="display: none;"><h3>'.$term_data->name.'</h3><div>';
            $tabpopup .= $tabpopup_content;
            $tabpopup .= '</div></div>';

            $slidebase .= '<div class="slidebase noborder tabber"><h3>'.$term_data->name.'</h3><div>';
            $slidebase .= $slidebase_content;
            $slidebase .= '</div><p><a href="#" id="p'.str_pad( $popup, 2, 0, STR_PAD_LEFT ).'" class="mediumgraybutton">More</a></p></div>';

            $ajax_content .= $tabpopup;
            $ajax_content .= $slidebase;

        endif;

        // .processitem
        $ajax_content .= '</div>';

        if($slide%3==0)
            $ajax_content .= '</div><!--slide-->';

        $slide++; $popup++;
    }

    if(($slide-1)%3!=0)
        $ajax_content .= '</div><!--slide-->';

    echo $ajax_content;
    die;
}

function my_nonlogin_wpcategories(){
    global $wpdb;
    $slide = 1;
    $popup = 1;
    $ajax_content = '';
    $register_url = 'http://yoursite.com/register';

    $taxonomy = 'wpcategories';
    $parent_term = $_GET['term'];

    $parent_term_id = $wpdb->get_var("SELECT term_id FROM $wpdb->terms WHERE slug='$parent_term'");
    $child_term = get_term_children( $parent_term_id , $taxonomy );

    foreach($child_term as $term){

        if($slide==1 || $slide%3==1)
            $ajax_content .= '<div class="slide">';

        $term_data = get_term_by('id', $term, $taxonomy);
        $args = array(
            'post_type' => 'whitepaper',
            'tax_query' => array(
                array(
                    'taxonomy'  => $taxonomy,
                    'field'     => 'id',
                    'terms'     =>  $term
                )
            ),
            'posts_per_page' => -1
        );

        $tabpopup = $slidebase = '';
        $pop_i = 1;
        $my_post = new WP_Query($args);

        // .processitem
        $ajax_content .= '<div class="processitem">';

        if($my_post->have_posts()) :
            while ( $my_post->have_posts() ) : $my_post->the_post();
                if($pop_i<=5)
                    $tabpopup_content .= '<p><a href="'.$register_url.'">'.get_the_title().'</a></p>';
                $pop_i++;
                $slidebase_content .= '<p><a href="'.$register_url.'">'.get_the_title().'</a></p>';
            endwhile;

            $tabpopup .= '<div id="pop'.str_pad( $popup, 2, 0, STR_PAD_LEFT ).'" class="tabpopup" style="display: none;"><h3>'.$term_data->name.'</h3><div>';
            $tabpopup .= $tabpopup_content;
            $tabpopup .= '</div></div>';

            $slidebase .= '<div class="slidebase noborder tabber"><h3>'.$term_data->name.'</h3><div>';
            $slidebase .= $slidebase_content;
            $slidebase .= '</div><p><a href="#" id="p'.str_pad( $popup, 2, 0, STR_PAD_LEFT ).'" class="mediumgraybutton">More</a></p></div>';

            $ajax_content .= $tabpopup;
            $ajax_content .= $slidebase;

        endif;

        // .processitem
        $ajax_content .= '</div>';

        if($slide%3==0)
            $ajax_content .= '</div>';

        $slide++; $popup++;
    }

    if(($slide-1)%3!=0)
        $ajax_content .= '</div><!--slide-->';

    echo $ajax_content;
    die;
}
add_action('wp_ajax_wpcategories_action', 'my_login_wpcategories');
add_action('wp_ajax_nopriv_wpcategories_action', 'my_nonlogin_wpcategories');

// enqueue our ajax script file and passing ajaxurl value
function my_ajax_load_scripts() {
    // get our custom-script.js
    wp_enqueue_script('my-custom-script', get_template_directory_uri() . '/js/custom-script.js');
    // globalize admin-ajax.php url for ajax processing page
    wp_localize_script('my-custom-script', 'my_wp', array(
            'ajaxurl' => admin_url('admin-ajax.php'),
            'action'  => 'wpcategories_action'
        )
    );
}
add_action('wp_enqueue_scripts', 'my_ajax_load_scripts');