I installed HTML Validator plugin – it shows me no error just warnings.
I cleanup some of the warning (25 from 66), but when I tried the other one, it mess up my design.
Most of the warning are with images in the middle, where this php code is used:
<?php $clanky_query = new WP_Query('category_name=clanky&showposts=4');
while ($clanky_query->have_posts()) : $clanky_query->the_post(); ?>
<div class='clanky'>
<a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>">
<?php
if (function_exists('samsarin_the_thumbnail'))
$before = "";
$after = "";
samsarin_the_thumbnail("before=$before&after=$after");
?>
<h3><?php the_title(); ?></h3></a></div>
<?php endwhile; ?>