query_posts join with custom table

Hi.

I have table in my DB called wp_bp_wpisy (post_id, group_id, date_added)

I need to get all posts with specific group_id, order this by date_added and I need pagination for this.

I tried like this(found on forum):

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

$wpdb->bp_wpisy = $wpdb->prefix . 'bp_wpisy';

function mam_posts_join ($join) {
   global $mam_global_join;
   if ($mam_global_join) $join .= " $mam_global_join";
   return $join;
}
function mam_posts_where ($where) {
   global $mam_global_where;
   if ($mam_global_where) $where .= " $mam_global_where";
   return $where;
}
function mam_posts_orderby ($orderby) {
   global $mam_global_orderby;
   if ($mam_global_orderby) $orderby = $mam_global_orderby;
   return $orderby;
}
add_filter('posts_join','mam_posts_join');
add_filter('posts_where','mam_posts_where');
add_filter('posts_orderby','mam_posts_orderby');

$mam_global_join = " JOIN $wpdb->bp_wpisy AS wpisy ON $wpdb->posts.ID = wpisy.post_id  ";
$mam_global_where = " and wpisy.group_id = 2";
$mam_global_orderby = " wpisy.dodano ASC";

query_posts("paged=$paged");
/$mam_global_join = $mam_global_where = $mam_global_orderby = '';  // Turn off the filters

Can you help me ?