query_posts() and pagination issues

I know this has been asked and answered many times, but simply I cant get this to work. I have tried all the solutions posted here and over Internet, but they not work in my case 🙂

I want to display some posts with specific tags with custom time line.
Right now my code looks like this:

<div class="someclass">
<?php function filter_where($where = '') {
$where .= " AND post_date >= '2010-01-01' AND post_date < '2010-08-01'";
return $where;
}
add_filter('posts_where', 'filter_where');
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts('tag=tagone,tagtwo&paged=$paged');?>
<?php
$i=0;
if (have_posts()) : while (have_posts()) : the_post(); $i++ ?>
<?php $thumb = get_post_meta($post->ID, 'thumbnail', $single = true); ?>
<p> <?php echo $i.'. '; the_title(); ?> </p>
<?php endwhile; endif; ?>
</div> <!--content-block putopis end-->
<?php if(function_exists('wp_pagenavi')) { wp_pagenavi(); } ?>
<?php wp_reset_query(); ?>

Code above work as it should. It display posts from 2010-01-01 to 2010-08-01, which have tags “tagone” and “tagtwo”