my $limit_3 = param("limit_3");
my $limit = param("limit");
$limit = ($limit_3 + $limit);

print $limit; # and rest of form

##</code><code>##

use strict;
use CGI qw(:standard);

my $i = param('hidden_i') || 0;
my @view = qw(
   first second third   fourth
   fifth sixth  seventh eighth
);

my $view = $view[$i++];

param('hidden_i',$i % @view);

print header, 
   start_html('hidden fields'),
      h1($view),
      start_form,
         hidden('hidden_i'),
         submit,
      end_form,
   end_html,
;