Add skip to section links

add_skip.js

// Add skip links to sections
SECT.add_skip = function() {
  // Create a placeholder we can append to
  var $skip = $('<div class="skip"></div>');
  
  $('.body .section').each(function(){
    _section = $(this);

    // Check the section has an id we can link to and a subheading
    if (_section.attr('id').length && (_section.find('h2').length > 0) ) {

      // Check if section is below the fold
      if ( _section.offset().top > $(window).height() ) {

        // Append a link to our placeholder
        $link = $('<a href=""></a>')
          .attr('href','#' + _section.attr('id'))
          .text(_section.find('h2:first').text())
          // .click(get localScroll working here!)
          ;
        $skip.append($link);
      }
    }
  });
  
  // Delimit the list of links
  if ($skip.text().length > 0) {
    var $count = $skip.find('a').length
    
    if ($count > 1) {
      $skip.find('a:last').before(' or ');
    }
    
    if ($count > 2) {
      var $n = $count - 1
      $skip.find('a:lt(' + $n + ')').before('<span class="delim">, </span>');
    }
    // Change the text before the first link
    $skip.find('.delim:first').text('Skip to ');

    // Insert the placeholder
    $('#options ul').before($skip);
  }

}