弹出层

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>弹出层</title>
    <script type ="text/javascript" src ="jquery-1.4.2.min.js" ></script>
    <script type ="text/javascript" >
    $(document).ready(function()
    {
     //动画速度
     var speed=500;
     //绑定事件处理
     $("#btnShow").click(function(event)
     {
     //取消事件冒泡
     event.stopPropagation();
     //设置弹出层的位置
     var offset=$(event.target).offset();
     $("#divTop").css({top:offset.top+$(event.target).height()+"px",left:offset.left});
     $("#divTop").show(speed);

     })

     //单击空白区域隐藏层
     $(document).click(function(event)
     {
      $("#divTop").hide(speed);
     }
     )
     //单击层隐藏自身
     $("#divTop").click(function(event)
     {
      $("#divTop").hide(speed);
     })

    }

    )

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <br /><br /><br />
    <button id ="btnShow">显示提示文字</button>
    </div>

    <div id ="divTop" style ="background-color:#f0f0f0; border : solid 1px #000000; position :absolute ; display :none ; width :300px ; height :100px">
     <div style =" text-align:center "> 弹出层</div>
    </div>
    </form>
</body>
</html>