<!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" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript"></script>
</head>
<body>
<img src = "jd1.png" id = "changeImg">
<script type="text/javascript">
var imgObj = document.getElementById("changeImg");
imgObj.onmouseover = function()
{
imgObj.src = "jd2.png";
}
imgObj.onmouseout = function()
{
imgObj.src = "jd1.png";
}
imgObj.onmouseup = function()
{
imgObj.src = "1.jpg";
}
imgObj.onmousedown = function()
{
imgObj.src = "2.jpg";
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/nasca/p/6087807.html