<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link rel="stylesheet" href="layout.css" media="screen"/>
</head>
<body onload="countBodyChildren()">
<h1>Snapshots</h1>
<ul>
<li><a href="Blue hills.jpg" onclick="showPic(this);return false;" title="the mountain of blue">山峦</a></li>
<li><a href="Sunset.jpg" onclick="showPic(this);return false;" title="red enjoy it">日出</a></li>
<li><a href="Water lilies.jpg" onclick="showPic(this);return false;" title="a summer flower">荷花</a></li>
<li><a href="Winter.jpg" onclick="showPic(this);return false;" title="a white world">雪林</a></li>
</ul>
<img id="placeholder" src="gallery.JPG" alt="my image gallery"/>
<p id="description">Choose an image</p>
<script type="text/javascript" src="showPic.js"></script>
</body>
</html>
showPic.js
function showPic(whichpic){
var source=whichpic.getAttribute("href");
var placeholder=document.getElementById("placeholder");
placeholder.setAttribute("src",source);
var text=whichpic.getAttribute("title");
var description=document.getElementById("description");
description.firstChild.nodeValue=text;
}
layout.css
@charset "utf-8";
/* CSS Document */
body{
font-family:Arial, Helvetica, sans-serif;
color:#333;
font-family:"新宋体";
background-color:#ccc;
}
h1{
color:#333;
background-color:transparent;
}
a{
color:#c60;
background-color:transparent;
font-weight:bold;
text-decoration:none;
}
ul{
padding:0;
}
li{
float:left;
padding:1em;
list-style:none;
}
img{
display:block;
clear:both;
}
原文：http://www.cnblogs.com/daochong/p/4843123.html