<p align=center><font size=6 face="黑体"><b>2008年北京奥运会</b></font></p>
<script language=JavaScript> 
<!--
var now = new Date();                          // 创建当前日期对象

function currenttime() 
{ 
var dtime = new Date("8/8/2006");              // 距离日期
now.setTime(now.getTime()+100);                // 设置毫秒
if((dtime - now) <= 0)
{
alert("倒计时已经结束！")
}

days = (dtime - now) / 1000 / 60 / 60 / 24;    // 计算剩余天数
daysRound = Math.floor(days); 
hours = (dtime - now) / 1000 / 60 / 60 - (24 * daysRound);   // 计算剩余小时数 
hoursRound = Math.floor(hours); 
minutes = (dtime - now) / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);    
// 计算剩余分钟数 
minutesRound = Math.floor(minutes); 
if(minutesRound<=9)
minutesRound="0"+minutesRound
seconds = (dtime - now) / 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);                                        // 计算剩余秒数 
secondsRound = Math.floor(seconds); 
if(secondsRound<=9)
secondsRound="0"+secondsRound
time.innerHTML = daysRound + "天" +hoursRound + "小时" + minutesRound + "分" + secondsRound + "秒";                                     // 输出当前剩余的时间
}
setInterval("currenttime()",100); 
//-->
</script> 
<p align=center>距离2008年8月8日还有<span id="time"></span></p>