sub _default_section_direction($$)
{
  my $self = shift;
  my $direction = shift;

  my $result = undef;
  my $href = $self->_element_direction($self->{'current_element'},
                                           $direction, 'href');
  my $node = $self->_element_direction($self->{'current_element'},
                                           $direction, 'text');
  my $anchor;                              
  if (defined($href) and defined($node) and $node =~ /\S/) {
    my $anchor_attributes = $self->_direction_href_attributes($direction);
    $anchor = "<a href=\"$href\"${anchor_attributes}>$node</a>";
  #} elsif (defined($node) and $node =~ /\S/) {
  #  $anchor = $node; 
  #} else {
  }
  if (defined($anchor)) {
    # i18n
    $result = $self->get_conf('BUTTONS_TEXT')->{$direction}.": $anchor";
  }
  return $result;
}

my @buttons = ([ 'NodeNext', \&_default_section_direction ],
               [ 'NodePrev', \&_default_section_direction ],
               [ 'NodeUp', \&_default_section_direction ], ' ',
               'Contents', 'Index');

foreach my $buttons ('SECTION_BUTTONS', 'CHAPTER_BUTTONS', 'TOP_BUTTONS',
                     'MISC_BUTTONS', 'SECTION_FOOTER_BUTTONS') {
  set_from_init_file($buttons, address@hidden);
}

set_from_init_file('LINKS_BUTTONS',
    ['Top', 'Index', 'Contents', 'About', 'Up', 'NextFile', 'PrevFile']);