ajax callback html

<?php

function your_callback_to_return_content(){
    $data_one = $_POST['data_one'];
    $data_two = $_POST['data_two'];

    switch($data_one){
        case 'data1':
            ## Your Data1 HTML content ## ?>
            <div id="#whitepapersshow">
                <div class="slide"">
                    <!-- Column 1 -->
                    <div class="processitem"></div>
                    <!-- Column 2 -->
                    <div class="processitem"></div>
                    <!-- Column 3 -->
                    <div class="processitem"></div>
                </div>
                <div class="slide"">
                    <!-- Column 1 -->
                    <div class="processitem"></div>
                    <!-- Column 2 -->
                    <div class="processitem"></div>
                   <!-- Column 3 -->
                    <div class="processitem"></div>
                </div>
            </div>
        <?php
        break;
        case 'data2':
            ## Your Data2 HTML content ## ?>
            <div id="#whitepapersshow">
                <div class="slide"">
                    <!-- Column 1 -->
                    <div class="processitem"></div>
                    <!-- Column 2 -->
                    <div class="processitem"></div>
                   <!-- Column 3 -->
                    <div class="processitem"></div>
                </div>
                <div class="slide"">
                    <!-- Column 1 -->
                    <div class="processitem"></div>
                    <!-- Column 2 -->
                    <div class="processitem"></div>
                    <!-- Column 3 -->
                    <div class="processitem"></div>
                </div>
            </div>
        <?php
        break;
        case 'data3':
            ## Your Data3 HTML content ## ?>
            <div id="#whitepapersshow">
                <div class="slide"">
                    <!-- Column 1 -->
                    <div class="processitem"></div>
                    <!-- Column 2 -->
                    <div class="processitem"></div>
                    <!-- Column 3 -->
                    <div class="processitem"></div>
                </div>
            </div>
        <?php
        break;
    }

    die;
}
add_action('wp_ajax_my_action', 'your_callback_to_return_content');
add_action('wp_ajax_nopriv_my_action', 'your_callback_to_return_content');

// enqueue our ajax script 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')
        )
    );
}
add_action('wp_enqueue_scripts', 'my_ajax_load_scripts');

?>