var intervalId = null; 
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){ 
this.stayTime=nStayTime*1000 || 6000; 
this.maxHeigth=nMaxHth || 420; 
this.minHeigth=nMinHth || 2.5; 
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 + 10) : (h - 10))+"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,30); 
}