CSS代码 鼠标移动到图片上，变成另一张图片，帮忙看下代码问题
<html>
<head>
<title>index_05_01</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<style>
.pp td a{
width:200px;
height:292px;
background:url(images/index_05_01_01.jpg);/*图片地址*/
display:block;
}
.pp td a:hover{
width:200px;
height:292px;
background:url(images/index_05_01_03.jpg);/*替换的图片地址*/
display:block;
}
</style>
</head>
<div class="pp">
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<!-- Save for Web Slices (index_05_01.jpg) -->
<table id="__01" width="1001" height="292" border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
<img src="images/index_05_01_01.jpg" width="250" height="292" alt=""></td>
<td>
<img src="images/index_05_01_02.jpg" width="251" height="292" alt=""></td>
<td>
<img src="images/index_05_01_03.jpg" width="250" height="292" alt=""></td>
<td>
<img src="images/index_05_01_04.jpg" width="250" height="292" alt=""></td>
</tr>
</table>
<!-- End Save for Web Slices -->
</body>
</div>
</html>
我想先试试看，鼠标放到第一张图片上，变成第三张图片 但是没用。求解决
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<html><head>
<title>index_05_01</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<style>
.pp td a{
width:200px;
height:292px;
background:url(images/index_05_01_01.jpg);/*å¾çå°å*/
display:block;
}
.pp td a:hover{
width:200px;
height:292px;
background:url(images/index_05_01_03.jpg);/*æ¿æ¢å¾çå°å*/
display:block;
}
</style>
</head>
<div class="pp">
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<!-- Save for Web Slices (index_05_01.jpg) -->
<table id="__01" width="1001" height="292" border="0" cellpadding="0" cellspacing="0" class="pp">
<tr>
<td>
<a>第1å¼ å¾ç</a></td>
<td>
<a>第2å¼ å¾ç</a></td>
<td>
<a>第3å¼ å¾ç</a></td>
<td>
<a>第4å¼ å¾ç</a></td>
</tr>
</table>
<!-- End Save for Web Slices -->
</body>
</div>
</html>
