syntax error, unexpected $end

Parse error: syntax error, unexpected $end in C:\xampp\htdocs\spv2\wp-content\themes\viewport\index.php on line 63

Not sure why I’m getting the error, anyways my index.php file is below.

<?php get_header(); ?>

	<div id="mid" class="index">

		<!-- Start slider -->
		<div class="stripViewer">
			<div class="panelContainer">

			<?php if (have_posts()) : ?>

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

				<div class="panel" id="post-<?php the_ID(); ?>" title="<?php the_title() ?>">
					<div class="wrapper">
						<?php $image = get_post_meta($post->ID, 'lead_image', true); ?>
						<img src="<?php echo $image; ?>" alt="" width="940" height="600" />
						<div class="post-title">
							<?php print_post_title() ?>
						</div>
						<div class="entry">
							<?php the_excerpt(); ?>
						</div>
					</div>
				</div>

				<?php endwhile; ?>

				<div class="panel" id="nav-panel">
					<div class="wrapper">
						<a href="https://www.flickr.com/photos/shar-fuh-deen/sets/72157621673630837/"><img src="<?php bloginfo('template_directory'); ?>/i/art.jpg" alt="" width="940" height="600" /></a>
                    </div>
			  </div>

			<?php else : ?>

			<?php endif; ?>

            <?php
					query_posts( 'showposts=4&offset=3' );
					if (have_posts()) : $counter = 0;
						while (have_posts()) : the_post(); $category = get_the_category();

						if( $counter % 2 == 0 )
							$end = "";
						else
							$end = "last";
				?>

			</div><!-- .panelContainer -->
		</div><!--.stripViewer -->

	</div><!-- .mid -->

	<div class="stripNavR" id="stripNavR0"><a href="#"><img src="<?php bloginfo('template_directory'); ?>/i/right.png" alt="Right" /></a></div>

    <div id="comment-home"><!-- Comments -->
	<?php $withcomments = 1 ?> 

	<?php comments_template(); ?>  

    </div><!-- /Comments -->

    <?php get_footer(); ?>