index.php

<?php get_header(); ?>
<div id="contentWrap">
   <?php $firstClass = 'firstpost';
if (have_posts()) :
   while (have_posts()) : the_post(); ?>

      <!-- post -->
      <div id="<?php echo $firstClass; ?>">
      <?php if ($firstClass == 'firstpost') : ?>
         <?php $firstClass = 'post'; ?>
                <div class="meta">
                     <?php the_time('d/m/Y') ?>
                    </div>
                    <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
                    <div class="entry">
                    <?php if ( has_post_thumbnail() ) {
                            the_post_thumbnail('medium');
                            }
                        the_excerpt(); ?>
                    </div>
      <?php else : ?>
                <div class="meta">
                     <?php the_time('d/m/Y') ?>
                    </div>
                    <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
                    <div class="entry">
                    <?php if ( has_post_thumbnail() ) {
                            the_post_thumbnail('thumbnail');
                            }
                        the_excerpt(); ?>
                    </div>
      <?php endif; ?>
   <?php endwhile; ?>
      <!-- code here for after loop -->
<?php else : ?>
   <!-- code here for no posts found -->
<?php endif; ?>

</div> <!-- end contentWrap -->
<?php include("sidebar.php"); ?>

<?php include("sidebar2.php"); ?>

<?php get_footer(); ?>