// JavaScript Document
var intervalId = null;

function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){
 this.stayTime=nStayTime*1000 || 3000;
 this.maxHeigth=nMaxHth || 300; //广告最大高度
 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 +5 ) : (h - 5))+"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";
   //document.getElementById("ccc").style.display="block"
  }
  
 }
 
 
 function closeBox(){
  slideAd(id,this.stayTime,"up",nMaxHth,nMinHth);
 }
 
 intervalId = window.setInterval(openBox,2);
}