syntax error in search.php

<?php get_header(); ?>
	<div id="main">
        <div id="content">
            <!-- Loop Begins -->
            <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
            <div class="intro">
                <span class="thumbnail">
                    <a href="<?php the_permalink() ?>" class="thetip" title="<?php the_title() ?> :: <?php the_content_rss('', TRUE, '', 50); ?>"><img src="<?php $key="thumbnail"; echo get_post_meta($post->ID, $key, true); ?>" alt="thumb"/></a>
                </span>
                <div class="intropost">
                    <h3><a href="<?php the_permalink() ?>"><?php the_title() ?></a></h3>
                    <p class="introcontent"><?php the_content_rss('', TRUE, '', 50); ?></p>
                    <div class="introinfo">
                        <a href="<?php the_permalink() ?>#comments"><span class="comments"><p><?php comments_number('0', '1', '%'); ?></p></span></a>
                        <span class="date"><p><?php the_time('F j, Y'); ?></p></span>
                    </div>
                </div>
            </div>
            <?php endwhile; else: ?>
            <?php endif; ?>
            <!-- Loop Ends -->
            <div class="intro">
                <span class="thumbnail">
                    <img src="<?php bloginfo('template_url'); ?>/images/404.jpg"/>
                </span>
                <div class="intropost">
                    <h3>Sorry, Nothing Here by That Name</h3>
                    <p>You seem to have found a mis-linked page or search query with no associated results. Please trying your search again. If you feel that you should be staring at something a little more concrete, feel free to email the author of this site or browse the archives.</p>
                </div>
            </div>
          <?php endif; ?>
        </div>
        
        <?php get_sidebar(); ?>
    </div>
<?php get_footer(); ?>