var now = new Date();
function createtime(){
var grt= new Date("9/06/2008 20:00:00");
now.setTime(now.getTime()+250);
if(grt>=now)
{
times = grt-now;
msg="距北京残奥运会还有：";
}
else
{
times=now-grt;
msg="北京残奥会进行了：";
}
//奥运倒计时
 days = times / 1000 / 60 / 60 / 24;

dnum = Math.floor(days);
hours = times / 1000 / 60 / 60 - (24 * dnum);
hnum = Math.floor(hours);
if(String(hnum).length ==1 ){
  hnum = "0" + hnum;
}
minutes = times / 1000 /60 - (24 * 60 * dnum) - (60 * hnum);
mnum = Math.floor(minutes);
if(String(mnum).length ==1 ){
  mnum = "0" + mnum;
}
seconds = times / 1000 - (24 * 60 * 60 * dnum) - (60 * 60 * hnum) - (60 * mnum);
snum = Math.round(seconds);
if(String(snum).length ==1 ){
  snum = "0" + snum;
}
//在div中可修改时钟显示的样式
if(dnum==0)
{
msg+=+ hnum +"时"+ mnum +"分"+ snum+"秒";
}
else
{
msg+= +dnum +"天"+ hnum +"时"+ mnum +"分"+ snum+"秒";
}
document.getElementById("Olympic_time").innerHTML=msg;
}
setInterval("createtime()",250);