$(function(){

        var nav = $('#function_nav');
        var nav_li = $('#function_nav ul li');
        var h2 = $('#function_main_title');

        var fotter_ul = $("nav#footerContent ul");
        var fade_in_flg = 0;

        var page_top_li = document.createElement('li');
        page_top_li.id = "page_top_li";

        var page_top_a = document.createElement('a');
        page_top_a.id = "page_top_a";
        page_top_a.innerHTML = "ページ先頭へ↑";


        $(window).scroll(function () {
          if($(window).scrollTop() > 604)
          {
            nav.addClass('function_nav_fixed');
            nav.css('height','62px');
            nav_li.addClass('function_fixed_li');
            h2.css('height','264px');
            if(fade_in_flg == 0)
            {
              nav.css('display','none');
              nav.fadeIn("normal");
              $(fotter_ul).append(page_top_li);
              $(page_top_li).append(page_top_a);
            }
            fade_in_flg = 1;
          }
            else
          {
            nav.removeClass('function_nav_fixed');
            nav.css('height','114px');
            nav_li.removeClass('function_fixed_li');
            h2.css('height','110px');
            fade_in_flg = 0;
            $(page_top_li).remove();
          }
        });

        function scroll_screen(target_height)
        {
          $('html,body').animate({ scrollTop: target_height }, 'normal');
        }
        $("nav#function_nav a").click(function(){
          var target_number = $(this).attr("id").split("_")[2];
          var target_position = $("section#function_main_sec_" + target_number).offset().top;
          scroll_screen(target_position - 104);

          return false;
        });
          $(document).ready(function(){
            if(target)
            {
              var target_position = $("section#function_main_sec_" + target).offset().top;
              scroll_screen(target_position - 104);
            }
          });


window.addEventListener("DOMContentLoaded", init, false);

var play_flag = "stop";

function init(){
  var function_video = document.getElementById("function_video");
  function_video.addEventListener("play", play, false);
  function_video.addEventListener("playing", playing, false);
  function_video.addEventListener("pause", pause, false);
  function_video.addEventListener("ended", stop, false);
};


function play(){
  if(play_flag == "stop")
  {
    play_flag = "play";
    ga('send', 'event', 'movie_play', 'click', 'function_video');
  }
};
//for IE
function playing(){
  if(play_flag == "stop")
  {
    play_flag = "play";
    ga('send', 'event', 'movie_play', 'click', 'function_video');
  }
};
function pause(){
  if(play_flag == "play")
  {
    play_flag = "plaing";
  }
};

function stop(){
    play_flag = "stop";
};


});