function get_post_data(){

  // Switch based on region
  switch($_REQUEST['region']) {
    //Asia
    case 'China':
    case 'Japan':
        class Post{
            function get_post(){
                global $more;
                $more = 0;
                query_posts('p=122');
                if(have_posts()) : while(have_posts()) : the_post();
                 the_title( '<h2>', '</h2>' );
                 the_post_thumbnail('medium');
                 the_content( '<p>', '</p>' );
                endwhile;
                endif;
                wp_reset_query();
            }
        }
      break;

    //Middle East
    case 'Pakistan':
    case 'Afghanistan':
        class Post{
            function get_post(){
                global $more;
                $more = 0;
                query_posts('p=123');
                if(have_posts()) : while(have_posts()) : the_post();
                 the_title( '<h2>', '</h2>' );
                 the_post_thumbnail('medium');
                 the_content( '<p>', '</p>' );
                endwhile;
                endif;
                wp_reset_query();
            }
        }
      break;
    //etc
  }

  $post = new Post();
  $post->get_post();
  echo json_encode($post);
  die();
}

add_action('wp_ajax_get_post_data', 'get_post_data');
add_action('wp_ajax_nopriv_get_post_data', 'get_post_data');
?>

onRegionClick: function(element, code, region)
{
    $.ajax(get_data.ajaxurl, {
        data: {region: region, 'action': 'get_post_data'},
        dataType: 'json',
        success: function(response) {
            $("#post").html(response);
        }
    });

}