网页上JS显示倒计时

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<b><font color="blue">奥运会开幕还有:</font>
<font color="red"><span id="timeDate">载入天数...</span><span id="times">载入秒数...</span>
<script type="text/javascript"><!--
var now = new Date();
function createtime(){

var grt= new Date("8/08/2008 20:00:00");

now.setTime(now.getTime()+250);
days = (grt - now) / 1000 / 60 / 60 / 24;
dnum = Math.floor(days);
hours = (grt - now) / 1000 / 60 / 60 - (24 * dnum);
hnum = Math.floor(hours);
if(String(hnum).length ==1 ){hnum = "0" + hnum;}
minutes = (grt - now) / 1000 /60 - (24 * 60 * dnum) - (60 * hnum);
mnum = Math.floor(minutes);
if(String(mnum).length ==1 ){mnum = "0" + mnum;}
seconds = (grt - now) / 1000 - (24 * 60 * 60 * dnum) - (60 * 60 * hnum) - (60 * mnum);
snum = Math.round(seconds);
if(String(snum).length ==1 ){snum = "0" + snum;}

document.getElementById("timeDate").innerHTML = dnum+"天";
document.getElementById("times").innerHTML = hnum + ":" + mnum + ":" + snum;
}

setInterval("createtime()",250);
// --></script>
</font></b>

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