my $pages     = 25;
my $curr_page = 13;
my $page_size = 6;
my ( $links, $curr_range) = pager("/cgi-bin/script.pl", $pages, $curr_page, $page_size);
print "Current page array[$curr_page] display range $curr_range\n\n", $links;


sub pager {
    my ( $link, $total, $curr_page, $page_size ) = @_;
    $link .= $link =~/\?/ ? "&" : '?';
    $curr_page ||= 0;
    $page_size ||= 6;
    my @links;
    my $current_range = 'Unkown';
    for ( my $start = 0; $start < $total; $start += $page_size ) {
        my $end = ($start+$page_size)>$total ? $total : $start+$page_size;
        my $range = $start+1 == $end ? $start+1 : sprintf "%d-%d", $start+1, $end;
        $end -=1;   # we show 1-10 but this is 0-9 in array terms
        push @links, ($curr_page >= $start and $curr_page <= $end) ? "$range\n" 
            : qq!<a href="${link}start=$start&end=$end">$range</a>\n!;
        $current_range = $range if ($curr_page >= $start and $curr_page <= $end);
    }
  return (join ' | ', @links) , $current_range;
}

__DATA__
Current page array[13] display range 13-18

<a href="/cgi-bin/script.pl?start=0&end=5">1-6</a>
 | <a href="/cgi-bin/script.pl?start=6&end=11">7-12</a>
 | 13-18
 | <a href="/cgi-bin/script.pl?start=18&end=23">19-24</a>
 | <a href="/cgi-bin/script.pl?start=24&end=24">25</a>