<pre>
<html>
<head>
<meta http-equiv="Content-Type" c/>
<title>无标题文档</title>
</head>
<body>
<p>移动鼠标上去看看效果<br/>
<img src="images/click_green.gif" width="100" height="50"
border="0" alt="Example button" name="button"
onmouseover="document.images[0].src='images/click_red.gif'"
onmouseout="document.images[0].src='images/click_green.gif'"/>
</p>
</body>
</html>
</pre>