jQuery_jquery를 기반으로 Baidu 홈페이지 슬라이딩 탭 효과 코드 모방

<div class="main-page">
  <div class="left">
   <div class="nav-back">
   </div>
   <div class="nav">
    <div class="on">
     导航</div>
    <div>
     新闻</div>
    <div>
     世界杯</div>
    <div>
     音乐</div>
    <div>
     彩票</div>
   </div>
  </div>
  <div class="right">
   <div class="content-back">
   </div>
   <div class="content">
    <div>
     站长素材1</div>
    <div>
     站长素材2</div>
    <div>
     站长素材3</div>
    <div>
     站长素材4</div>
    <div>
     站长素材5</div>
   </div>
  </div>
  <div class="clear">
  </div>
</div>

body
{
 background: url(images/65.jpg) no-repeat fixed center center;
}
.clear
{
 clear: both;
}
.main-page
{
 margin: 200px auto 0 auto;
 width: 700px;
 height: 300px;
}
.main-page .left, .main-page .right
{
 float: left;
}
.main-page .nav-back
{
 width: 60px;
 height: 300px;
 background: #000;
 opacity: .3;
 filter: alpha(opacity=30);
}
.main-page .nav
{
 position: relative;
 margin-top: -300px;
 width: 60px;
 text-align: center;
 font-size: 14px;
 font-family: "微软雅黑";
 color: #fff;
}
.main-page .nav div
{
 height: 32px;
 line-height: 28px;
}
.main-page .nav div.on
{
 background: #0094ea;
}
.main-page .right
{
 width: 620px;
 height: 300px;
 margin-left: 20px;
}
.main-page .content-back
{
 width: 620px;
 height: 300px;
 background: #fff;
 opacity: .3;
}
.main-page .content
{
 position: relative;
 width: 600px;
 height: 280px;
 margin-top: -300px;
 padding: 10px;
 overflow: hidden;
}
.main-page .content div
{
 width: 600px;
 height: 280px;
 margin-bottom: 10px;
 background: #fff;
}

$(".main-page .nav div").mouseenter(function () {
 var $this = $(this);
 var index = $this.index();
}).mouseleave(function () {
 var $this = $(this);
 var index = $this.index();
}).click(function () {
 var $this = $(this);
 var index = $this.index();
 var l = -(index * 290);
 $(".main-page .nav div").removeClass("on");
 $(".main-page .nav div").eq(index).addClass("on");
 $(".main-page .content div:eq(0)").stop().animate({ "margin-top": l }, 500);
});