高分问一个简单问题
有一个网页代码如下:
<!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=gb2312" />
<meta name="keywords" content="JS代码,相册代码,JS广告代码,JS特效代码" />
<meta name="description" content="此代码内容为纵向的JS相册效果,属于站长常用代码,更多相册代码代码请访问懒人图库JS代码频道。" />
<title>纵向的JS相册效果_懒人图库</title>
<style>
body {background:#000000;margin:20px 0;font:12px Verdana, Arial, Tahoma;text-align:center;vertical-align:middle;color:#FFFFFF}
img {border:none}
.txt_1 {font:bold 24px Verdana, Tahoma;color:#fff}
img.thumb_img {cursor:pointer;display:block;margin-bottom:10px}
img#main_img {cursor:pointer;display:block;}
#gotop {cursor:pointer;display:block;}
#gobottom {cursor:pointer;display:block;}
#showArea {height:355px;margin:10px;overflow:hidden}
.info {color:#666;font:normal 9px Verdana;margin-top:20px}
.info a:link, .info a:visited {color:#666;text-decoration:none}
.info a:hover {color:#fff;text-decoration:none}
</style>
</head>
<body>
<table width="760" border="0" align="center" cellpadding="0" cellspacing="5">
<tr>
<td height="75" colspan="2" align="left" class="txt_1">纵向的JS相册效果</td>
</tr>
<tr>
<td width="640" align="center"><img src="images/03.jpg" alt="懒人图库" width="640" height="400" border="0" id="main_img" rel="images/03.jpg" link="http://www.lanrentuku.com" /></td>
<td width="110" align="center" valign="top">
<img src="images/gotop.gif" width="100" height="14" id="gotop" />
<div id="showArea">
<img src="images/01.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/01.jpg" link="http://www.lanrentuku.com" />
<img src="images/02.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/02.jpg" link="http://www.lanrentuku.com" />
<img src="images/03.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/03.jpg" link="http://www.lanrentuku.com" />
<img src="images/01.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/01.jpg" link="http://www.lanrentuku.com" />
<img src="images/02.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/02.jpg" link="http://www.lanrentuku.com" />
<img src="images/02.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/03.jpg" link="http://www.lanrentuku.com" />
<img src="images/01.jpg" alt="懒人图库" width="80" height="50" border="0" class="thumb_img" rel="images/01.jpg" li