Timeline with categories

Hi Everyone.

I’m trying to make a timeline with posts in het categorie “timeline” and with as children the years. So i used to a code i found here:
http://wordpress.org/support/topic/listing-child-categories-and-posts-1?replies=5

and i want to make a 2 column stucture so i used this tutorial:
http://perishablepress.com/two-column-horizontal-sequence-wordpress-post-order/
And i wanted to combine them.

So i get made this piece:

<?php
//get terms (e.g. categories or post tags), then display all posts in each retrieved term
$taxonomy = 'category';//  e.g. post_tag, category
$param_type = 'category__in'; //  e.g. tag__in, category__in
$term_args=array(
  'orderby' => 'name',
  'order' => 'DESC',
  'child_of' => 5
);
$terms = get_terms($taxonomy,$term_args);
if ($terms) {
  foreach( $terms as $term ) {
    $args=array(
      "$param_type" => array($term->term_id),
      'post_type' => 'post',
      'post_status' => 'publish',
      'showposts' => -1,
      'caller_get_posts'=> 1
      );
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {

      echo '<div class="year_cntr"><ul class="photos_left">'; $count = 0;

      while ($my_query->have_posts()) : $i++; if(($i % 2) == 0) : $my_query->next_post(); else : $my_query->the_post(); ?>

	  <?php $count++; ?>

        	<li>
        		<div class="photo_cntr" style="float: right;">
					<div class="cell"><?php if ( has_post_thumbnail() ) { the_post_thumbnail( 'photo', array('class' => 'photo_'.$count.'') ); } ?><h3><?php the_title(); ?></h3><?php the_content() ?>
                	</div>
            	</div>
			</li>

	<?php endif; ?>
       <?php
             endwhile;
    }
	echo '</ul><ul class="photos_right">';
	$i = 0; rewind_posts();;
   	while ($my_query->have_posts()) : $i++; if(($i % 2) !== 0) : $my_query->next_post(); else : $my_query->the_post();
	$count++;?>
    <li>
        <div class="photo_cntr" style="float: left;">
		<div class="cell">
		<?php if ( has_post_thumbnail() ) { the_post_thumbnail( 'photo', array('class' => 'photo_'.$count.'') ); } ?>
		<h4><?php the_title(); ?> </h4>
		<?php the_content() ?> </div>
        </div>
    </li>
	<?php endif; ?>
    <?php
             endwhile;
	echo '</ul><div class="yearstamp">' . $term->name. '</div></div>';
  }
  echo 'test';
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>

This thing works OK for some children categories, but others give the same results in the “<ul class=”photos_left”>” as in the “<ul class=”photo_right”>”.

And i’m really stuck on this because i don’t know why??!?!?!

English is not my native tongue and my coding is noob style, so i hope this problem is readable.

Greets from Amsterdam,

Erik