<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="http://www.google.com/intl/en/images/logo.gif" /></p></div>
![http://www.google.com/intl/en/images/logo.gif"](http://www.google.com/intl/en/images/logo.gif"){kind=link}
<!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>
<title>鼠标经过图片半透明效果，支持Firefox/IE</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body {background:#000;}
.img_link{filter:alpha(opacity=50); /* IE */
-moz-opacity:0.5; /* Moz + FF */
opacity:0.5; /* 支持CSS3的浏览器（FF 1.5也支持）*/
}
.img_link:hover {
filter:alpha(opacity=100); /* IE */
-moz-opacity:1; /* Moz + FF */
opacity:1; /* 支持CSS3的浏览器（FF 1.5也支持）*/
}
</style>
</head>
<body>
<img class="img_link" src="http://www.tmxhx.com/attachments/month_0808/k2008823103739.jpg" alt="测试效果" onMouseOver="this.className='null'" onMouseOut="this.className='img_link'" />
</body>
</html>
![http://www.tmxhx.com/attachments/month_0808/k2008823103739.jpg"](http://www.tmxhx.com/attachments/month_0808/k2008823103739.jpg"){kind=link}