Div with empy id like, id=" "

This page leaves me with an empty ID on the <div class=”entry”> that holds the post.

If it is wrong I would really appreciate knowing why?

Many thanks

Martin

get_header(); ?>

		<div id="container">
			<div id="content" role="main">

				<h1 class="page-title"><?php
					//printf( __( 'Category Archives: %s', 'twentyten' ), '<span>' . single_cat_title( '', false ) . '</span>' );
				?>The PictoPoetry!</h1>
 <!-- Start the Loop. -->
<?php $c = 0;
		if (have_posts()) : while (have_posts()) : the_post()
			;$c++;
		if( $c == 1 ) $my_id = ' id="first"';
			else $my_id = ''; ?>
 <!-- The following tests if the current post is in category 15. -->
 <!-- If it is, the div box is given the CSS class "post-cat-fifteen". -->
 <!-- Otherwise, the div box will be given the CSS class "post". -->
<?php if ( in_category('15') ) { ?>
           <div class="post-cat-fifteen"<?php echo $my_id;?> >
 <?php } else { ?>
           <div class="post" <?php echo $my_id;?>>
 <?php } ?>

<!-- <img src="<?php //echo get_post_meta($post->ID, "thumbnail", true);?>" style="float: left;"/>  -->

 <!-- Display the Title as a link to the Post's permalink. -->
 <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>

 <!-- Display the date (November 16th, 2009 format) and a link to other posts by this posts author. -->
 <small><?php the_time('F jS, Y') ?> by <?php the_author_posts_link() ?></small>

 <!-- Display the Post's Content in a div box. -->
 <div class="entry" id=" <?php get_post_meta($post_id, $key); ?>">
   <?php the_content(); ?>
 </div>

 <!-- Display a comma separated list of the Post's Categories. -->
 <p class="postmetadata">Posted in <?php the_category(', '); ?></p>
 </div> <!-- closes the first div box -->

 <!-- Stop The Loop (but note the "else:" - see next line). -->
 <?php endwhile; else: ?>

 <!-- The very first "if" tested to see if there were any Posts to -->
 <!-- display.  This "else" part tells what do if there weren't any. -->
 <p>Sorry, no posts matched your criteria.</p>

 <!-- REALLY stop The Loop. -->
 <?php endif; ?>

			</div><!-- #content -->
		</div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>