前台代码：


<title></title>

<script type="text/javascript">


function showImg() {


document.getElementById('img').setAttribute("src", "p_w_picpaths/图片1.png");

}

</script>

<style type="text/css">

.style1

{

width: 256px;

height: 256px;

}

</style>

</head>

<body>

<form id="form1" runat="server">

<div>

<asp:ImageButton ID="ImageButton1" runat="server" Height="48px"

ImageUrl="~/SystemManagement/p_w_picpaths/login_form_17.jpg"

Width="171px" />

<img id ="img" class="style1" src="p_w_picpaths/图片3.png" /></div>

</form>

</body>

</html>


后台调用：

protected void Page_Load(object sender, EventArgs e)

{


}

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)

{


Page.ClientScript.RegisterStartupScript(ClientScript.GetType(),"showImg", " <script>showImg();</script>");

}