random php template

Hi everybody, I’m michel.

I’m trying to solve a simple problem, just a matter of syntax probably but I don’t know php and I’m learning now to use wordpress’ tags..

so, I had to display randomly 4 different columns in a page, but in the column there’s a div containing an image and a title with a link to a post, so things got a little complicated and I figured including a php template was a good solution.
Let’s say I created 3 php pages named cat-4-feat-1.php , cat-4-feat-2.php , cat-4-feat-3.php
in which the code is:

<div class="box_pict">

<?php

query_posts('p=20');
?>
<?php while (have_posts()) : the_post(); ?>

   <a id="pict_featured_3" href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
      <img class="c" src="http://localhost/wordpress/wp-content/uploads/2009/07/featured_1.jpg" />
      <p id="post_37">
      inspiration 4
      </p>
   </a>

<?php endwhile; ?>

</div>

(obviously the post id and the image number change every time)

and I included the template in my page with:

<?php include( TEMPLATEPATH . '/cat-4-feat-3.php' ); ?>

but I need to modify that path with a function to make the number random.
I’ve seen using something like this:
<?php echo(rand(1,5)); ?>
but I don’t know how to use it in this situation coz I’m not familiar with php language.

can you help?