$(window).load(function () {
$("div#1990box").hide();
$("div#2000box").hide();
$("div#2010box").hide();
});

$(document).ready(function() {
  $("img.btn01").click(function() {
  document.btn01.src = "/history/img/year_btn01_on.gif";
  document.btn02.src = "/history/img/year_btn02_off.gif";
  document.btn03.src = "/history/img/year_btn03_off.gif";
  document.btn04.src = "/history/img/year_btn04_off.gif";
									});
  $("img.btn02").click(function() {
  document.btn01.src = "/history/img/year_btn01_off.gif";
  document.btn02.src = "/history/img/year_btn02_on.gif";
  document.btn03.src = "/history/img/year_btn03_off.gif";
  document.btn04.src = "/history/img/year_btn04_off.gif";
									});
  $("img.btn03").click(function() {
  document.btn01.src = "/history/img/year_btn01_off.gif";
  document.btn02.src = "/history/img/year_btn02_off.gif";
  document.btn03.src = "/history/img/year_btn03_on.gif";
  document.btn04.src = "/history/img/year_btn04_off.gif";
									});
  $("img.btn04").click(function() {
  document.btn01.src = "/history/img/year_btn01_off.gif";
  document.btn02.src = "/history/img/year_btn02_off.gif";
  document.btn03.src = "/history/img/year_btn03_off.gif";
  document.btn04.src = "/history/img/year_btn04_on.gif";
									});
  
  $("#tab_select a").click(function() {
    $($("#tab_select a.sel").attr("href") + "box").hide();
    $("#tab_select a.sel").removeClass("sel");
    $(this).addClass("sel");
    $($(this).attr("href") + "box").fadeIn("fast");
  });
  

});