WP-PageNavi not working on Custom page Template

this is my code in Custom page Template

<?php query_posts('showposts=8'); ?>    
<?php 
$count = 1;
if (have_posts()) : while (have_posts()) : the_post(); if($count == 1) : ?>

& this is wp_pagenavi code

<div class="more_entries">
<?php if (function_exists('wp_pagenavi')) wp_pagenavi(); else { ?><?php } ?></div>
</div>

page numbers showing but navigation not working

Looks like Old Famous Problem with paged

try this for quey_posts();

 $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;

 query_posts(array(
   'posts_per_page' => 8,
   'paged' => $paged
  )
 );