极难：C#按钮触发JavaScript弹出窗口？

protected void button1_Click(object sender, EventArgs e)
{

  string html ="Hello World! <br> Hello CSDN <br>";

//弹出一个JavaScript 半透明窗口，显示上面html的内容。

}

---

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JScript code:
<script type="text/javascript" language="javascript">

function sAlert(){

var str="test弹窗效果trybb.com";

var msgw,msgh,bordercolor;

msgw=400;//提示窗口的宽度

msgh=100;//提示窗口的高度

titleheight=25 //提示窗口标题高度

bordercolor="#c51100";//提示窗口的边框颜色

titlecolor="#c51100";//提示窗口的标题颜色



var sWidth,sHeight;

sWidth=screen.width;

sHeight=screen.height;



var bgObj=document.createElement("div");

bgObj.setAttribute('id','bgDiv');

bgObj.style.position="absolute";

bgObj.style.top="0";

bgObj.style.background="#cccccc";

bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";

bgObj.style.opacity="0.6";

bgObj.style.left="0";

bgObj.style.width=sWidth + "px";

bgObj.style.height=sHeight + "px";

bgObj.style.zIndex = "10000";

document.body.appendChild(bgObj);



var msgObj=do