Post from category in sidebar

Hi,

I’m building a review site that is about Disney theme parks. Each resort is a category (ie 7 cats). I’ve been searching an not getting far for the past 2 weeks trying to solve the problem, so here it is.
I have 2 versions of the same sidebar. One version displays recent posts from a category. The other the intention is to display posts from the same category the current post is on.
I’ve been using is_category and in_category on the 2 versions.
The main problem I have hit is that on the in-category version I end up with lists of all categorys or none.
the link is http://www.disney-links.com/linksreview
If you click on a post from the WDW category you’ll get a list from WDW and DLR and DLRP in the sidebar. In the loop these are assigned as in_category all other cats are assigned as is_category.
DLRP seems to work fine possibly as this is the last in the run being in_category.

<?php
// Walt Disney World
 	 if (in_category('6')) : ?>
        <u>Walt Disney World related sites</u>
        <?php
    $my_query = new WP_Query('cat=6&showposts=15'); ?>
        <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
      <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Disneyland Resort
 	 if (in_category('7')): ?>
    <u>Disneyland Resort related sites</u>
<?php
    $my_query = new WP_Query('cat=7&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
      <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Disneyland Resort Paris
 	if (in_category('8')) : ?>
      <u>Disneyland Resort Paris related sites</u>
    <?php
    $my_query = new WP_Query('cat=8&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
          <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Toyko Disneyland
 	if (is_category('9')) : ?>
      <u>Tokyo Disneyland related sites</u>
   <?php
    $my_query = new WP_Query('cat=9&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
          <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Hong Kong Disneyland
 	if (is_category('10')) : ?>
      <u>Hong Kong Disneyland related sites</u>
    <?php
    $my_query = new WP_Query('cat=10&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
          <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Disney Cruise Lins
 	if (is_category('11')) : ?>
      <u>Disney Cruise Line related sites</u>
      <?php
    $my_query = new WP_Query('cat=11&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
          <?php endwhile; ?>
      <?php endif; ?>
      <?php
// Disney Vacation Club
 	if (is_category('12')) : ?>
      <u>      Disney Vacation Club related sites</u>
     <?php
    $my_query = new WP_Query('cat=12&showposts=15'); ?>
    <?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

<li><a>" href="<?php the_permalink() ?>"><?php the_title(); ?></a><br/></li>
          <?php endwhile; ?>
      <?php endif; ?>