z-index html：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="author" content="Chomo" />
<link rel="start" href="http://www.14px.com" title="Home" />
<title>�����壺��ͬ��Ԫ�أ�����һ������Ԫ��ӵ�ж�̬��λʱ��ͬʱ��������Ѱ�Ҷ�̬��λ����Ԫ�أ����ֱ������ó��߱�����������Ԫ�أ����䱾�������бȽϡ�</title>
</head>
<style type="text/css">
div { font:12px/1.5 arial;}
div strong { color:#fff; background:#036; display:inline-block;}
h3 strong { color:#f00;}
/*--- ���巽������ ---*/
.div1,
.div2 {
height:70px;
width:150px;
background:#cff;
border:1px solid #036;
}
.grandDiv1,
.grandDiv2 {
padding:10px;
border:1px solid #060;
width:174px;
background:#cf9;
}
.parentDiv1,
.parentDiv2 {
padding:10px;
border:1px solid #f06;
width:152px;
background:#fcf;
}
/*--- ���巽��ƫ��λ�á�����λ�� ---*/
.grandDiv2 {
margin-top:-50px;
margin-left:95px;
}
.parentDiv2 {
margin-top:-40px;
margin-left:85px;
}
.div2 {
margin-top:-20px;
margin-left:75px;
padding-top:30px;
height:40px;
}
.grandDiv2 .parentDiv2,
.grandDiv2 .div2,
.parentDiv2 .div2 { margin:0;}
</style>
<body>
<h3>������<strong>����Ҫ��</strong>����ͬ��Ԫ�أ�����һ������Ԫ��ӵ�ж�̬��λʱ��ͬʱ��������Ѱ�Ҷ�̬��λ����Ԫ�������е���Ԫ�ص���һ��Ϊֹ�����ֱ������ó��߱�����������Ԫ�أ����䱾�������бȽϡ�</h3>
<p>����1����Ԫ�ص�z-index���۶���Ԫ�ش��߾��ϡ�<p>
<div class="parentDiv1" style="position:relative; z-index:2;">
.parentDiv1{position:relative;<strong>z-index:2</strong>}
<div class="div1">.div1{position:static}</div>
</div>
<div class="parentDiv2" style="position:relative; z-index:1;">
<div class="div2" style="position:relative; z-index:10000;">.div2{position:relative;<strong>z-index:10000</strong>}</div>
.parentDiv2{position:relative;<strong>z-index:1</strong>}
</div>
<p>����2����Ԫ�ؾ��£���Ԫ��Ҳ���Ծ��ϡ�<p>
<div class="parentDiv1">
.parentDiv1{position:staitc}
<div class="div1" style="position:relative;">.div1{position:relative}</div>
</div>
<div class="parentDiv2">
<div class="div2">.div2{position:staitc}</div>
.parentDiv2{position:staitc}
</div>
<p>����1������2������չ�Ƚϡ�<p>
<div class="grandDiv1" style="position:relative; z-index:3;">
.grandDiv1{position:relative;<strong>z-index:3</strong>}
<div class="parentDiv1">
.parentDiv1{position:staitc}
<div class="div1" style="position:relative; z-index:10000;">.div1{position:relative;<strong>z-index:10000</strong>}</div>
</div>
</div>
<div class="grandDiv2">
<div class="parentDiv2" style="position:relative; z-index:4;">
<div class="div2">.div2{position:staitc}</div>
.parentDiv2{position:relative;<strong>z-index:4</strong>}
</div>
.grandDiv2{position:static;}
</div>
</body>
</html>