<title>显示和隐藏图片</title>
<script type="text/javascript">
function hidden_b2(){
document.getElementById("b2").style.visibility="hidden";
}
function none_b2(){
document.getElementById("b2").style.display="none";
}
</script>
</head>
<body>
<img src="images/book1.jpg" alt="book1" id="b1" />
<img src="images/book2.jpg" alt="book2" id="b2" />
<img src="images/book3.jpg" alt="book3" id="b3" /><br />
<input name="btn1" type="button" value="visibility隐藏图b2" onclick="hidden_b2()" />
<input name="btn2" type="button" value="display隐藏图b2" onclick="none_b2()" />
</body>
