//==== 滑动展开收缩广告
var intervalId = null;
function slideAd(id,nStayTime,sState,nMaxHth,nMinHth){
stayTime=nStayTime*1000000 || 3000;
maxHeigth=nMaxHth || 400;
minHeigth=nMinHth || 1;
state=sState || "down" ;
var obj = document.getElementById(id);
if(intervalId != null)window.clearInterval(intervalId);
    function openBox(){
        var h = obj.offsetHeight;
        obj.style.height = ((state == "down") ? (h + 400) : (h - 2))+"px";
        if(obj.offsetHeight>maxHeigth){
        window.clearInterval(intervalId);
        intervalId=window.setInterval(closeBox,stayTime);
        }
		if (obj.offsetHeight<minHeigth){
		window.clearInterval(intervalId);
		obj.style.display="none";
		}
}
	function closeBox(){
	slideAd(id,stayTime,"up",nMaxHth,nMinHth);
	}
intervalId = window.setInterval(openBox,10);
}