unclosed start-tag requires SHORTTAG YES
<div id="headerimg">


<?php if ( is_singular() ) wp_enqueue_script( 'comment-reply' ); ?>

<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<div id="page">


<div id="header"
<div id="headerimg">
<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
<div class="description"><?php bloginfo('description'); ?></div>
</div>
</div>
<hr />