求助!这段怎么改? - 编程论坛

请问:我要把这段代码改成---"点我试试"换成图片,当点击这个图片,弹出的DIV里就显示这张图片.要把这两张图片关联起来,做成相册.
大家帮帮忙,请问怎么改?

<style>
body {font-size:12px;background:#9EC7E7}
img {border:0px}
#msgDiv {
    z-index:10001;
    width:500px;
    height:400px;
    background:white;
    border:#336699 1px solid;
    position:absolute;
    left:50%;
    top:20%;
    font-size:12px;
    margin-left:-225px;
    display: none;
}
#bgDiv {
    display: none;
    position: absolute;
    top: 0px;
    left: 0px;
    right:0px;
    background-color: #777;
    filter:progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75)
    opacity: 0.6;
}
</style>
<script type="text/javascript">
function showDetail() {
//背景
  var bgObj=document.getElementById("bgDiv");
  bgObj.style.width = document.body.offsetWidth + "px";
  bgObj.style.height = screen.height + "px";

//定义窗口
  var msgObj=document.getElementById("msgDiv");
  msgObj.style.marginTop = -75 +  document.documentElement.scrollTop + "px";

//关闭
  document.getElementById("msgShut").onclick = function(){
  bgObj.style.display = msgObj.style.display = "none";
  }
  msgObj.style.display = bgObj.style.display = "block";
  msgDetail.innerHTML="<p align=center>小窗口里的内容</p>"
}
</script>
</head>

<body>

<div id="msgDiv">
    <div id="msgShut">
        关闭</div>
    <div id="msgDetail">
    </div>
</div>
<div id="bgDiv">
</div>
<p>　</p>
<p><a href="#" onClick="showDetail()">点我试试</a></p>
<p></a>　</p>
<p>　</p>
<p>　</p>
<p>　</p>

</body>

</html>