posts in random order ONLY on homepage

Hi

This theme is realy great!
I would like if the posts on the main page would be randomized on every load. I have done it with the code: query_posts('orderby=rand')

…but there is a problem: all posts shown on every category and tag pages of my menu. I want it only in main loop. Is there any solution?

/****************************************************************************************/

if ( ! function_exists( 'attitude_theloop_for_archive' ) ) :
/**
 * Fuction to show the archive loop content.
 */
function attitude_theloop_for_archive() {
	global $post;
query_posts('orderby=rand');
	if( is_front_page() ) {
		while( have_posts() ) {
			the_post();

			do_action( 'attitude_before_post' );
?>
	<section id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
		<article>

			<?php do_action( 'attitude_before_post_header' ); ?>