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<style type="text/css">
body {
margin: 0;
padding: 0;
text-align: center;
background-color: #eee;
}
#bd {
margin: 20px auto;
padding: 5px 20px 20px;
border:1px solid #bbb width:600px;
background-color:#9CCE2E;
}
#popup {
width: 300px;
height: 132px;
padding: 10px;
position: absolute;
left:443px;
top:15px;
border:1px solid blue;
background-color: #fff;
filter:alpha(opacity=60);
opacity:0.4;
}
#popup iframe {
display:none;
display:block;
position:absolute;
top:0;
left:0;
z-index:-1;
filter:mask();
width:3000px;
height:3000px;
}
</style>

<div id="bd">
  <h1>ÈÃdiv¸¡ÓÚselectÖ®ÉϵÄÍêÃÀ½â¾ö·½°¸</h1>
  <h3>www.php0731.cn</h3>
  <div class="parameter">
    <label for="ddTest">ÏÂÀ­¿ò</label>
     <select id="ddTest">
      <option>PHPÏîÄ¿</option>
       <option>PHP½Ì³Ì</option>
     </select>
   </div>
 </div>
 <div id="popup">ÈÃdiv¸¡ÓÚselectÖ®ÉϵÄÍêÃÀ½â¾ö·½°¸
   <!--[if lte IE 6.5]><iframe></iframe><![endif]-->
</div>