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倒计时的代码

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>倒记时</title>
</head>
<body>
<TABLE width=760 height=50 border=0 align="center" cellPadding=0 cellSpacing=0
background="css/aoyu-bg.png" id=table48>
  <TBODY>
  <TR>
    <TD vAlign=bottom>
      <DIV align=center>
      <TABLE width="100%" border=0 align="center" cellPadding=0 cellSpacing=0 id=table56>
        <TBODY>
        <TR>
          <TD width=535> </TD>
          <TD vAlign=top height=29><FONT color=#ffffff><FONT
            color=#ffffff>距奥运会开幕还有:<SPAN id=timeDate>载入天数...</SPAN><SPAN
            id=times>载入倒计时秒...</SPAN>
                <SCRIPT>
var now = new Date();
function createtime(){

var grt= new Date("4/28/2011 0:00:00");

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

setInterval("createtime()",250);               
</SCRIPT>
</FONT></FONT></TD></TR></TBODY></TABLE></DIV></TD></TR></TBODY></TABLE>
</body>
</html>
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