javascript倒计时功能：

离活动截止时间还有<span id="_lefttime" style="color:red;"></span>
<SCRIPT LANGUAGE="JavaScript">
function _fresh()
{
 var endtime=new Date("May 8, 2010 17:00:00");
 var nowtime = new Date();
 var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
 if(leftsecond<0){leftsecond=0;}
 __d=parseInt(leftsecond/3600/24);
 __h=parseInt((leftsecond/3600)%24);
 __m=parseInt((leftsecond/60)%60);
 __s=parseInt(leftsecond%60);
 __all = __d+"天 "+__h+"小时"+__m+"分"+__s+"秒";
 document.getElementById("_lefttime").innerHTML=__d+"天 "+__h+"小时"+__m+"分"+__s+"秒";
}
_fresh()
setInterval(_fresh,1000);
</SCRIPT>