js控制div层的叠加简单方法

<style type="text/css">.favorite_icon{float:left; padding: 0 0 0 30px;}.favorite_label{float:left; width:950px;}.favorite_label h2{  border-bottom: medium none;height: 60px;padding: 0.8em 0 0 0px;}.favorite_title{height:60px;margin:0px auto 12px auto;}.favorite_title a:link, .favorite_title a:visited {color: #333; background-color:#8bb65a;}.favorite_title a:hover {color: #333;text-decoration: none; background-color:#6c9541;}.add_favorite {border-radius: 0;color: #fff !important;font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif; font-size: 12px;line-height: 17px;padding: 5px 16px;float: right !important;border: medium none; height: 18px;background-image: none;cursor: pointer;display: inline-block;font-weight: 400;margin-bottom: 0; text-align: center;vertical-align: middle;white-space: nowrap;text-decoration: none;}#favorite_count{color:#303030;font-size:12px;padding: 0 0 0 7px;}.favorite_list{clear:both; padding: 0 10px 200px 10px;}.list_type li{float:left;line-height: 17px;} .list_type a{text-decoration: none;font-size: 15px;}.list_type a:link {color: #6c9541;}.list_type a:visited{color: #333;}.list_type a:hover {color: #6c9541;text-decoration: none;}.list_line{clear:both;height:10px; margin-bottom:10px;border-bottom:1px groove #ccc;}.nums{font-weight:bold;}.t1{border-bottom:1px dotted #ccc;height: 40px;padding: 0.8em 0 0 30px;}.list_content{clear:both;}.list_content h3{float:left; width:763px;}.list_content a{text-decoration:none; display:block;font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif;        font-size: 15px;color: #333; float:left; }.list_content a:link, .favorite_title a:visited {color:#333;text-decoration: none;}.list_content a:hover {color: #bb1c20;text-decoration: none; }.date{color:#ccc;font-size:13px;padding: 0 0 0 7px;float:left !important;text-align: center;      vertical-align: middle;white-space: nowrap;text-decoration: none; }.edit{ margin: 0 0 0 20px;}.delete{ margin: 0 0 0 10px;}.black_overlay{display:none;position:absolute;top:0%;left:0%;width:100%;height:100%;  background-color:black;z-index:1001;-moz-opacity:0.8;opacity:.10;filter:alpha(opacity=80);}.white_content{display:none;position:absolute;top:15%;left:25%;width:500px;height:250px;padding:16px;  border:1px solid #ccc;background-color:white;z-index:1002;overflow:auto;}.white_content a{float:right; color:#aca7a7;text-decoration: none;}.form-group{clear:both; margin:10px 0 10px 0;}.control-label{float:left; margin:10px 0 10px 30px;color:#aca7a7;}#url,#title{width:330px;height:23px;border:solid 1px #ccc; background:#f8f8f8;color:#8d8585;}.col-xs-9{float:left; margin:10px 0 10px 10px;}.btn-default,.btn-primary{float:right; width:80px;border-radius: 0;color: #fff !important;    font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif;font-size: 12px;line-height: 14px;    padding: 5px 18px;text-align: center;vertical-align: middle;white-space: nowrap;text-decoration: none;}.btn-default{border:solid 1px #ccc; background:#9a9a9a;color:#fff;margin:15px 20px 0 0;}.btn-default:hover {background:#8d8585;}.btn-primary{border:solid 1px #ccc; background:#8bb65a;color:#fff;margin:15px 78px 0 0;}.btn-primary:hover {background:#6c9541;}</style><div class="favorite_title">    <div class="favorite_label">      <img class="favorite_icon" width="48" height="48" src="http://127.0.0.1/phpcms/statics/images/favorite/favorite_icon_48_48.jpg"/>      <h2>  收藏<span id="favorite_count">（n个）</span>      <a class="add_favorite" href="javascript:void(0)" onclick="add_shoucang();">添加收藏</a>      </h2>    </div>  </div>  <div class="favorite_list">    <div class="list_type">      <ul class="all">       <li> <a href="#>全部(<span class="nums"></span>)</a></li>       <li> <a href="#">钢琴谱(<span class="nums"></span>)</a></li>       <li> <a href="#">钢琴曲(<span class="nums"></span>)</a></li>      </ul>    </div>    <div class="list_line">    </div>    <div class="list_content">      <ul class="navigation" id="navigation">        {loop $info $r}        <li class="t1">          <a href="#" ><label class="shoucangId" id="shoucangId" style="display:none;">{$r[id]}</label>                <h3>{$r[title]}</h3></a>         <span class="date">{date("Y-m-d",$r[inputtime])}</span>         <a class="edit" href="javascript:void(0)" onclick="edit_shoucang();">         <img alt="编辑" src="http://127.0.0.1/phpcms/statics/images/favorite/edit.jpg"/></a>         <a class="delete" href="JavaScript:void(0)" onclick="ConfirmDel();">         <img alt="删除" src="http://127.0.0.1/phpcms/statics/images/favorite/delete.jpg"/></a>         </li>        {/loop}        <li class="t1">         </li>      </ul>    </div>  </div>  </div>      <div id="light" class="white_content">  <a href="javascript:void(0)" onclick="document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">  <span>关闭</span></a>  <br>  <h2 style="color:#999292;">添加收藏</h2>  <div class="form-group">    <label for="url" class="control-label col-xs-2"><span>*</span>网址：</label>    <div class="col-xs-9">       <input id="url" type="text" name="url" class="form-control" value=" http://"/>    </div>  </div>    <div class="form-group">    <label for="title" class="control-label col-xs-2"><span>*</span>标题：</label>    <div class="col-xs-9">      <input id="title" type="text" name="title" class="form-control" />    </div>  </div>  <div class="form-group">    <label for="title" class="control-label col-xs-2"><span>*</span>类别：</label>    <div class="col-xs-9">     <label id="m1" >      <input type="radio" name="radio" id="radio_pu" value="钢琴谱" checked="checked"/><span>钢琴谱</span></label>     <label id="m2"><input type="radio" name="radio" id="radio_qu" value="钢琴曲" /><span>钢琴曲</span></label>    </div>  </div>    <div class="form-group">    <div class="col-xs-5 text-right">       <input type="submit" value="收藏" name="dosumbit" class="btn btn-primary"/>        <button type="button" class="btn btn-default" onclick="document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">取消</button>    </div>  </div><script type="text/javascript">//添加收藏function add_shoucang(){  document.getElementById('light').style.display='block';  document.getElementById('fade').style.display='block';  $("#title").val('');  $("#url").val('http://');  $("#shoucnag_id").val('');  $("input[name='radio'][value='钢琴谱']").attr("checked",true);}//删除function ConfirmDel() {  var _id;  if(confirm('确定删除？'))    {     $('.navigation>li').click(function(){      var iVal = $(this).index();      $('.navigation>li').eq(iVal).hide();      });   }    else    {   document.getElementById('light').style.display='none';   document.getElementById('fade').style.display='none'   }}</script>