Multiple Loops

<?php
global $query_string; // required
$query_string_backup = $query_string;
$posts = query_posts($query_string.'category_name=news&posts_per_page=3');?>

<?php while ( have_posts() ) : the_post(); ?> <?php endwhile; ?>

<!--Loop 2-->
<?php wp_reset_query(); // reset the query ?>
<?php
$posts = query_posts($query_string_backup.'category_name=jobs&posts_per_page=3');?>

<?php while ( have_posts() ) : the_post(); ?> <?php endwhile; ?>