<html>
<head>
<script type="text/javascript">
function changeSrc()
{
document.getElementById("myImage").src="/img/eg_landscape.jpg"
}
</script>
</head>
<body>
<img id="myImage" src="/img/eg_bulbon.gif" />
<br /><br />
<input type="button" onclick="changeSrc()" value="改变图像">
</body>
</html>