// function.php の getRecentKougabu を以下に差し替えます。
// ここから-->
function getRecentKougabu($limit, $max_width, $max_width, $category = false) {
	
	global $wpdb;
	
	if($category == false) {
		$results = $wpdb->get_col($wpdb->prepare(
			"SELECT"
			. "        ID"
			. "    FROM"
			. "        {$wpdb->posts}"
			. "    WHERE"
			. "        post_status = 'publish'"
			. "        AND post_type = 'post'"
			. "        AND post_password = ''"
			. "    ORDER BY"
			. "        post_date DESC LIMIT %d"
			, $limit
			));
	} else {
		$results = $wpdb->get_col($wpdb->prepare(
			"SELECT"
			. "        ID"
			. "    FROM"
			. "        {$wpdb->posts} as posts"
			. "        , {$wpdb->term_taxonomy} as taxonomy"
			. "        , {$wpdb->term_relationships} as relationships"
			. "    WHERE"
			. "        posts.ID = relationships.object_id"
			. "        AND relationships.term_taxonomy_id = taxonomy.term_taxonomy_id"
			. "        AND posts.post_status = 'publish'"
			. "        AND posts.post_type = 'post'"
			. "        AND posts.post_password = ''"
			. "        AND taxonomy.taxonomy = 'category'"
			. "        AND taxonomy.term_id = '%d'"
			. "    ORDER BY"
			. "        post_date DESC LIMIT %d"
			, $category
			, $limit
			));
	}
	if(count($results) == 0) return array();
	
	$images = kougabu_get_images(array(
	    'array' => true
	    , 'post_id' => $results
	    , 'max_width' => $max_width
	    , 'max_height' => $max_width));
	
	$retunrs = array();
	$count = 0;
	foreach($results as $id) {
		$post = &get_post($id);
		$retunrs[$count]['date'] = $post->post_date;
		$retunrs[$count]['title'] = $post->post_title;
		$retunrs[$count]['excerpt'] = $post->post_excerpt;
		if($retunrs[$count]['excerpt'] == '') {
			// excerpt が設定されていない場合は 15文字抜粋
			$retunrs[$count]['excerpt'] =
				mb_substr(strip_tags($post->post_content), 0, 15);
		}
		if(isset($images[$id])) {
			$retunrs[$count]['kougabu'] = $images[$id][0];
		}
		$count++;
	}
	
	return $retunrs;
}
// <--ここまで

// 追加したテーマファイルを書き換えます。
<?php foreach(getRecentKougabu(5, 100, 100) as $post) { ?>
<div class="entry">
<div class="thumbnail">
	<?php if(isset($post['kougabu'])) { echo $post['kougabu']; }?>
	"<?php echo mysql2date('Y年 n月 j日', $post['date']); ?>" - 
	"<?php echo $post['title']; ?>" - 
	<?php echo $post['excerpt']; ?> ...
</div>
</div>
<?php } ?>