超简单手风琴效果制作

<div id="firstpane" class="menu_list"> 
        <p class="menu_head">Header-1</p>
        <div class="menu_body">
        <a href="#">Link-1</a>
         <a href="#">Link-2</a>
         <a href="#">Link-3</a>    
        </div>
        <p class="menu_head">Header-2</p>
        <div class="menu_body">
            <a href="#">Link-1</a>
         <a href="#">Link-2</a>
         <a href="#">Link-3</a>    
        </div>
        <p class="menu_head">Header-3</p>
        <div class="menu_body">
          <a href="#">Link-1</a>
         <a href="#">Link-2</a>
         <a href="#">Link-3</a>            
       </div>
  </div> 

.menu_list {    
    width: 150px;
}
.menu_head {
    padding: 5px 10px;
    cursor: pointer;
    position: relative;
    margin:1px;
    font-weight:bold;
    background: #eef4d3 url(left.png) center right no-repeat;
}
.menu_body {
    display:none;
}
.menu_body a{
  display:block;
  color:#006699;
  background-color:#EFEFEF;
  padding-left:10px;
  font-weight:bold;
  text-decoration:none;
}
.menu_body a:hover{
  color: #000000;
  text-decoration:underline;
  }

$("#firstpane p.menu_head").click(function()
    {
        $(this).css({backgroundImage:"url(down.png)"}).next("div.menu_body").slideToggle(300).siblings("div.menu_body").slideUp("slow");
           $(this).siblings().css({backgroundImage:"url(left.png)"});
    });