div兑现模态窗口（转） _Web前端

div实现模态窗口（转）
<html>

<head>
   <title>两个层的特效</title>
   <style type="text/css">
       *{
           margin:0;padding:0;
       }
   </style>
</head>
<body>

<div class="cecmbody" id="cecmpolicy">
   <div class="leftClass">
          <p>测试</p>
    <input type="button" value="点击这里" onclick="sAlert('测试效果');" />

   </div>
   <div class="rightClass">
   </div>
</div>
     <script type="text/javascript" language="javascript">

    function sAlert(str){
    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="#336699";//提示窗口的边框颜色
    titlecolor="#99CCFF";//提示窗口的标题颜色

    var sWidth,sHeight;
    sWidth=document.body.offsetWidth;
    sHeight=screen.height;
    var bgObj=document.createElement("div");
    bgObj.setAttribute('id','bgDiv');
    bgObj.style.position="absolute";
    bgObj.style.top="0";
    bgObj.style.background="#777";
    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=document.createElement("div")
    msgObj.setAttribute("id","msgDiv");
    msgObj.setAttribute("align","center");
    msgObj.style.background="white";
    msgObj.style.border="1px solid " + bordercolor;
        msgObj.style.position = "absolute";
    msgObj.style.left = "50%";
               msgObj.style.top = "50%";
               msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
               msgObj.style.marginLeft = "-225px" ;
               msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
               msgObj.style.width = msgw + "px";
               msgObj.style.height =msgh + "px";
               msgObj.style.textAlign = "center";
               msgObj.style.lineHeight ="25px";
               msgObj.style.zIndex = "10001";

      var title=document.createElement("h4");
      title.setAttribute("id","msgTitle");
      title.setAttribute("align","right");
      title.style.margin="0";
      title.style.padding="3px";
      title.style.background=bordercolor;
      title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
      title.style.opacity="0.75";
      title.style.border="1px solid " + bordercolor;
      title.style.height="18px";
      title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
      title.style.color="white";
      title.style.cursor="pointer";
      title.innerHTML="关闭";
      title.onclick=function(){
           document.body.removeChild(bgObj);
                 document.getElementById("msgDiv").removeChild(title);
                 document.body.removeChild(msgObj);
                 }
      document.body.appendChild(msgObj);
      document.getElementById("msgDiv").appendChild(title);
      var txt=document.createElement("p");
      txt.style.margin="1em 0"
      txt.setAttribute("id","msgTxt");
      txt.innerHTML=str;
            document.getElementById("msgDiv").appendChild(txt);
             }
   </script>
</body>
</html>