jquery实现手风琴效果

手风琴效果
图示：

html代码：
<div id="acc">
<ul>
<li class="active">
<h4 class="active">红玫瑰</h4>
<div><img src="img/bg1.jpg"></div>
</li>
<li>
<h4>白玫瑰</h4>
<div><img src="img/bg2.jpg"></div>
</li>
<li>
<h4>白玫瑰</h4>
<div><img src="img/bg3.jpg"></div>
</li>
<li>
<h4>白玫瑰</h4>
<div><img src="img/bg4.jpg"></div>
</li>
<li class="last">
<h4>白玫瑰</h4>
<div><img src="img/bg5.jpg"></div>
</li>
</ul>

    </div>

    css代码：
    *{
            margin: 0;
            padding: 0;
        }
        img{
            border: none;
            display: block;
        }
            #acc {
                width: 640px;
                height: 140px;
                margin: 0 auto;
            }
            #acc ul  {
                border-left:1px solid #ddd ;
                height: 140px;
                position: relative;
            }
            #acc ul li {
                width:50px;
                height: 138px;
                border: 1px solid #ddd;
                float: left;
                list-style: none;
                border-left: 0;
                position: relative;
                overflow: hidden;
            }
            #acc ul li.active {
                width: 434px;

            }
            #acc ul li h4 {
                font-size: 14px;
                color: #000;
                font-weight:100;
                width: 14px;
                height: 98px;
                padding: 40px 18px 0;

            }
            #acc ul li h4.active {
                background: #f42760;
                color: #fff;
            }
            #acc ul li  div {
                width: 383px;
                height: 138px;
                background: blue;
                position: absolute;
                top: 0;
                left: 50px;
                border-left:1px solid #ddd ;
                z-index: 0;
            }
            #acc ul li img{
                width: 383px;
                height: 138px;
            }
            #acc ul li.last {
                position: absolute;
                top: 0;
                right: 0;
            }

js代码：
<script type="text/javascript">
$(function(){
$("li").click(function(){
$(this).children("h4").css({"background-color":"#f42760","color":"#fff"});
$(this).animate({
width: "434px"
},1000);
$(this).siblings().animate({
width: "50px"
},1000)
$(this).siblings().children("h4").css({"background-color":"#fff","color":"#000"});

            })
        })
    </script>