Div与CSS布局，最让人头疼的就是容器内的东西如何垂直居中的问题，我在做站时也遇到，查了一下资料，总结出以下居中办法，兼容IE与及Firefox。
方法一：
<style type="text/css">
<!--
* {margin:0;padding:0}
div {
width:500px;
height:500px;
border:1px solid #666;
overflow:hidden;
position:relative;
display:table-cell;
text-align:center;
vertical-align:middle
}
div p {
position:static;
+position:absolute;
top:50%
}
img {
position:static;
+position:relative;
top:-50%;left:-50%;
}
-->
</style>
<div><p><img src="upload/2010/3/201003080925510677.gif" /></p></div>方法二：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>div里面图片垂直居中的几个例子</title>
<style type="text/css">
<!--
body {
margin:0;padding:0
}
div {
width:500px;
height:500px;
line-height:500px;
border:1px solid #666;
overflow:hidden;
position:relative;
text-align:center;
}
div p {
position:static;
+position:absolute;
top:50%
}
img {
position:static;
+position:relative;
top:-50%;left:-50%;
vertical-align:middle
}
p:after {
content:".";font-size:1px;
visibility:hidden
}
-->
</style>
</head>
<body>
<div><p><img src="upload/2010/3/201003080925510677.gif" /></p></div>
</body>
</html>方法三：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>div里面图片垂直居中的几个例子</title>
<style type="text/css">
<!--
* {margin:0;padding:0}
div {
width:500px;
height:500px;
line-height:500px;
border:1px solid #666;
overflow:hidden;
position:relative;
text-align:center;
}
div p {
position:static;
+position:absolute;
top:50%;
vertical-align:middle
}
img {
position:static;
+position:relative;
top:-50%;left:-50%;
vertical-align:middle
}
-->
</style>
</head>
<body>
<div><p><img src="upload/2010/3/201003080925510677.gif" /></p></div>
</body>
</html>方法四：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>div里面图片垂直居中的几个例子</title>
<style type="text/css">
<!--
* {margin:0;padding:0;}
div {
width:500px;border:1px solid #666;
height:500px;
background:url("upload/2010/3/201003080916366805.gif") center no-repeat
}
-->
</style>
</head>
<body>
<div></div>
</body>
</html>