JS 全屏自动 下拉 隐藏代码

刚刚写的 JS 全屏广告代码..

4秒后下拉显示 ..然后上拉隐藏..

 

<script type="text/javascript">
var intervalId = null;
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){
  this.stayTime=nStayTime*3000 || 9000;
  this.maxHeigth=nMaxHth || 712;
  this.minHeigth=nMinHth || 1;
  this.state=sState || "down" ;
  var obj = document.getElementById(id);
  if(intervalId != null)window.clearInterval(intervalId);
function openBox(){
       var h = obj.offsetHeight;
       obj.style.height = ((this.state == "down") ? (h + 3) : (h - 3))+"px";
    if(obj.offsetHeight>this.maxHeigth){
        window.clearInterval(intervalId);
        intervalId=window.setInterval(closeBox,this.stayTime);
    }
    if (obj.offsetHeight<this.minHeigth){
        window.clearInterval(intervalId);
        obj.style.display="none";
    }    

}

function closeBox(){
       slideAd(id,this.stayTime,"up",nMaxHth,nMinHth);
  }
      intervalId = window.setInterval(openBox,10);
}
</script>
</head>

<body>
<div id="MyMoveAd" style="height:12px; width:960px; margin:0 auto;overflow:hidden;">
        <img src="61.jpg" />
    </div>
    <script type="text/javascript">
     <!--
     function openimg(){
        slideAd('MyMoveAd',2);
     }
        setTimeout(openimg,4000)
-->
    </script>
</body>

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