让div浮于select之上
CSS文件：
1 <style type="text/css">
2 body {
3 margin: 0;
4 padding: 0;
5 text-align: center;
6 background-color: #eee;
7 }
8 #bd {
9 margin: 20px auto;
10 padding: 5px 20px 20px;
11 border:1px solid #bbb width:600px;
12 background-color:#9CCE2E;
13 }
14 #popup {
15 width: 300px;
16 height: 132px;
17 padding: 10px;
18 position: absolute;
19 left:443px;
20 top:15px;
21 border:1px solid blue;
22 background-color: #fff;
23 filter:alpha(opacity=60);
24 opacity:0.4;
25 }
26 #popup iframe {
27 display:none;
28 display:block;
29 position:absolute;
30 top:0;
31 left:0;
32 z-index:-1;
33 filter:mask();
34 width:3000px;
35 height:3000px;
36 }
37 </style>
html文件：
1 <div id="bd">
2 <h1>让div浮于select之上的完美解决方案</h1>
3 <h3>www.php0731.cn</h3>
4 <div class="parameter">
5 <label for="ddTest">下拉框</label>
6 <select id="ddTest">
7 <option>PHP项目</option>
8 <option>PHP教程</option>
9 </select>
10 </div>
11 </div>
12 <div id="popup">让div浮于select之上的完美解决方案
13 <!--[if lte IE 6.5]><iframe></iframe><![endif]-->
14 </div>
