var intervalId = null;
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){
  this.stayTime=nStayTime*1000 || 3000;
  this.maxHeigth=nMaxHth || 350;
  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 + 2) : (h - 2))+"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);
}// JavaScript Document