Random posts on home page

Hello!

I'm looking for a way to set up home page to display random posts.

I founded something but i don't know if it is ok:
- to replace < ?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
with: < ?php query_posts(array('orderby' => 'rand', 'category_name' => SomeCategoryName, 'showposts' => 1)); if (have_posts()) : while (have_posts()) : the_post(); ?>

But i can't apply this because atahualpa theme is different.

Can you tell me what may i write instead

<?php while (have_posts()) : the_post(); $bfa_ata['postcount']++; ?>

<?php include 'bfa://content_inside_loop'; ?>

<?php endwhile; ?>

Thanks in advance