var urodz= new Date("August 8,2008"); 
var s = "2008北京奥运会"; 
var now = new Date(); 
var ile = urodz.getTime() - now.getTime(); 
var dni = Math.floor(ile / (1000 * 60 * 60 * 24)); 

if (dni > 1) 
document.write("离"+s+"开幕还有"+dni +"天") 
else if (dni == 1) 
document.write("离"+s+"开幕只有2天啦！") 
else if (dni == 0) 
document.write("离"+s+"开幕只有1天啦！") 
else 
document.write(s+"开幕已经过了哦！");