倒计时代码

 1<SCRIPT language=javascript> 
 2<!-- 
 3//document.write(""); 
 4
 5function show_date_time_2008(){ 
 6window.setTimeout("show_date_time_2008()", 1000); 
 7BirthDay=new Date("2008/9/14"); //这个日期是可以修改的 
 8today=new Date(); 
 9timeold=(BirthDay.getTime()-today.getTime()); 
sectimeold=timeold/1000 
secondsold=Math.floor(sectimeold); 
msPerDay=24*60*60*1000 
e_daysold=timeold/msPerDay 
daysold=Math.floor(e_daysold); 
e_hrsold=(e_daysold-daysold)*24; 
hrsold=Math.floor(e_hrsold); 
e_minsold=(e_hrsold-hrsold)*60; 
minsold=Math.floor((e_hrsold-hrsold)*60); 
seconds=Math.floor((e_minsold-minsold)*60); 
if(daysold<0)
{
    span_dt_dt_2008.innerHTML="<align=center><font color=696969>"+(-daysold)+"天前"+hrsold+"小时"+minsold+"分"+seconds+"秒"+"<br></font>" ; 
}
else
{
    span_dt_dt_2008.innerHTML="<align=center><font color=696969>"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒"+"<br></font>" ; 
}

} 

show_date_time_2008(); 

//--> 
</SCRIPT>

<span id="span_dt_dt_2008"></span>