How to call the Perticular category in different format by using single.php file

<?php } elseif (is_single( array( 661, 1, 513, 668) )){?>  

 <div id="content">

      <div class="innerPage">

       <div class="leftlinks">

         <div class="links_heading"><h2>App Development</h2></div>

          <div class="links">

       <ul>

                <?php //$my_query = new WP_Query('category_name=Products&post_status=publish');?>

             <li><a href="http://www.skyhawk.co/test/?p=661">White Label Website</a>   </li>

<li><a href="http://www.skyhawk.co/test/?p=1">Mercury Server</a>               </li>

    <li>        <a href="http://www.skyhawk.co/test/?p=513">custom development</a>       </li>

     <li><a href="http://www.skyhawk.co/test/?p=668">Airtime packages</a>   </li>

            </div>    </div>

            <div class="right_panel">

         <div class="right_content">

<?php wp_list_bookmarks('category_name=Links&title_li=&category_before=&category_after='); ?>

                                <?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?>

                                                <h2><?php the_title(); ?></h2>                                              

                                <?php the_content(); ?>

<?php edit_post_link( __( 'Edit', 'twentyten' ), '<span class="meta-sep">|</span> <span class="edit-link">', '</span>' ); ?>

                                <?php endwhile; ?>

          </div>

        </div>

</div>

 </div>

    <?php } else {?>

<div id="content">

                <div class="leftPart linksleftpart">

                                                <div class="leftPart linksleftpart">

                                                <?php wp_list_bookmarks('category_name=Links&title_li=&category_before=&category_after='); ?>

                                                </div>  </div>

        <div class="rightPart linksrightpart">

                                                <?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?>

                                                <h1><?php the_title(); ?></h1>

                                                <div class="divider"></div>

                                                <div class=""><?php the_content(); ?></div>

<?php edit_post_link( __( 'Edit', 'twentyten' ), '<span class="meta-sep">|</span> <span class="edit-link">', '</span>' ); ?>                                                <?php endwhile; ?>        </div></div>