I have updated 20 posts in wordpress theme. And i need to add my own text box after every 5 posts. So that i can add 4 text box after every 5 post. 
I think it can be done by `$post_counter` please any one give me a query for my question.

My code simply seems to,

```
<?php
query_posts( array('posts_per_page'=>20,orderby=>post_date, order=>desc) );
while ( have_posts() ) : the_post();
?>
<?php the_title(); ?>
<?php the_post_thumbnail(); ?>
<?php endwhile; ?>

```