/*
	$id: expand.js top of website expand ad script
*/
var intervalId = null; 
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth,ctrlId){ 
  this.stayTime=nStayTime*1000 || 3000; 
  this.maxHeigth=nMaxHth || 400; 
  this.minHeigth=nMinHth || 1; 
  this.state=sState || "down" ;
  var obj = document.getElementById(id); 
  var ctrlObj = document.getElementById(ctrlId) || null;
  
  if(intervalId != null)window.clearInterval(intervalId);
  
  function openBox(){ 
   var h = obj.offsetHeight; 
   obj.style.height = ((this.state == "down") ? (h + 2) : (h - 4))+"px";
   ctrlObj.style.display = (this.state == "down") ? "block" : "none";
   //ctrlObj.innerHTML = (this.state == "down") ? "关闭" : "展开";   
   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(){
	ctrlObj.style.display = "none";
	slideAd(id,this.stayTime,"up",nMaxHth,nMinHth,ctrlId); 
  }
	if(ctrlObj.addEventListener){
		 ctrlObj.addEventListener("click",closeBox, false);
	}else if(ctrlObj.attachEvent){
		ctrlObj.attachEvent("onclick",closeBox);
	}  
  intervalId = window.setInterval(openBox,1); 
}