var hmax = 265-1;//最大高度 
var hmin = 20;//最小高度 
var h=0; 
function addCount(){ 
if(h<hmax){ 
h += 20; 
setTimeout("addCount()",1); 
} 
else { 
h=hmax; 
setTimeout("noneAds()",50000); //停留时间自己适当调整 1000 = 1秒 
document.getElementById("ads").style.display = "none"; 
} 
document.getElementById("ads").style.display = ""; 
document.getElementById("ads").style.height = h+"px"; 
} 
window.onload = function showAds(){ 
document.getElementById("ads").style.display = "none"; 
document.getElementById("ads").style.height = "0px"; 

addCount(); //慢慢打开 
// h=hmax; 
// setTimeout("noneAds()",5000); //停留时间自己适当调整 1000 = 1秒 
} 
function openAds(){ 
h = 0;//高度 
addCount(); //慢慢打开 
} 
function noneAds(){ 
if(h>hmin) { 
h -= 20; 
setTimeout("noneAds()",1); 
} 
else { 
h = hmin; 
document.getElementById("ads").style.display = "none"; 
document.getElementById("ads").style.display ="none"; 
return; 
} 
document.getElementById("ads").style.height = h+"px"; 
}