post limit

<?php
$limit = get_option(‘posts_per_page’);
$paged = (get_query_var(‘paged’)) ? get_query_var(‘paged’) : 1;
query_posts(‘showposts=’ . $limit . ‘&paged=’ . $paged);
$wp_query->is_archive = true;
$wp_query->is_home = false;
?>
in the setting, Reading, Blog pages show at most is 10 however it just show 4 post at most! and page does not able to scroll !
is it a limitation because this theme is advertisement one, or something else and how can I handle this problem?
Andrina Theme