content-attachment.php

<?php
/**
 *
 * content*.php
 *
 * The post format template. You can change the structure of your posts or add/remove post elements here.
 * 
 * 'id' - post id
 * 'class' - post class
 * 'thumbnail' - post icon
 * 'title' - post title
 * 'before' - post header metadata
 * 'content' - post content
 * 'after' - post footer metadata
 * 
 * To create a new custom post format template you must create a file "content-YourTemplateName.php"
 * Then copy the contents of the existing content.php into your file and edit it the way you want.
 * 
 * Change an existing get_template_part() function as follows:
 * get_template_part('content', 'YourTemplateName');
 *
 */
global $post;
/* Display navigation to next/previous pages when applicable */
if (!empty($post->post_parent)) {
	$return_link = '<a href="' . get_permalink($post->post_parent) . '" title="' . esc_attr(sprintf(__('Return to %s', THEME_NS), strip_tags(get_the_title($post->post_parent)))) . '" rel="gallery">'
			. sprintf(__('<span class="meta-nav">&larr;</span> %s', THEME_NS), get_the_title($post->post_parent)) . '</a>';
	theme_post_navigation(array('next_link' => $return_link));
}

theme_ob_start();

if (wp_attachment_is_image()) {
	$attachments = array_values(get_children(array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID')));
	foreach ($attachments as $k => $attachment) {
		if ($attachment->ID == $post->ID)
			break;
	}
	$k++;
	$next_attachment_url = '';
	// If there is more than 1 image attachment in a gallery
	if (count($attachments) > 1) {
		if (isset($attachments[$k]))
		// get the URL of the next image attachment
			$next_attachment_url = get_attachment_link($attachments[$k]->ID);
		else
		// or get the URL of the first image attachment
			$next_attachment_url = get_attachment_link($attachments[0]->ID);
	} else {
		// or, if there's only 1 image attachment, get the URL of the image
		$next_attachment_url = wp_get_attachment_url();
	}
	?>
	<p class="attachment center">
		<a href="<?php echo $next_attachment_url; ?>" title="<?php echo esc_attr(strip_tags(get_the_title())); ?>" rel="attachment">
			<?php
			$attachment_size = apply_filters('attachment_size', 600);
			echo wp_get_attachment_image($post->ID, array($attachment_size, 9999)); // filterable image width with, essentially, no limit for image height.
			?>
		</a>
	</p>
	<?php
} else {
	?>
	<p class="attachment center">
		<a href="<?php echo wp_get_attachment_url(); ?>" title="<?php echo esc_attr(strip_tags(get_the_title())); ?>" rel="attachment">
			<?php echo basename(get_permalink()); ?>
		</a>
	</p>
	<?php
}

echo theme_get_content();

if (wp_attachment_is_image()) {
	$metadata = wp_get_attachment_metadata();
				echo '<p class="center">' . sprintf( __( 'Full size is %s pixels', THEME_NS),
					sprintf( '<a href="%1$s" title="%2$s">%3$s &times; %4$s</a>',
						wp_get_attachment_url(),
						esc_attr( __('Link to full-size image', THEME_NS) ),
						$metadata['width'],
						$metadata['height']
					)
	) . '</p>';
}

/* Display navigation to next/previous pages when applicable */
theme_post_navigation(array('wrap' => false, 'prev_link' => theme_get_next_image_link(false), 'next_link' => theme_get_previous_image_link(false)));

theme_post_wrapper(
		array(
			'id' => theme_get_post_id(),
			'class' => theme_get_post_class(),
			'title' => '<a href="' . get_permalink($post->ID) . '" rel="bookmark" title="' . strip_tags(get_the_title()) . '">' . get_the_title() . '</a>',
			'heading' => theme_get_option('theme_' . (is_home() ? 'posts' : 'single') . '_article_title_tag'),
			'before' => theme_get_metadata_icons('date,author,edit', 'header'),
			'content' => theme_ob_get_clean(),
		)
);
?>