cab

<?php $paged = get_query_var('paged'); ?>

<?php
$categorys = array(3,1,2);
for ($i=0; $i<count($categorys); $i++) :
?>

<?php query_posts( array(
'post_type' => 'post',
'posts_per_page' => 28,
'cat' => $categorys[$i],
'paged' => $paged
)); ?>

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