// JavaScript Document
var DifferenceHour = -1
var DifferenceMinute = -1
var DifferenceSecond = -1
var Tday = new Date("May 12, 2012 00:00:00")    //**倒计时时间点-注意格式
var daysms = 24 * 60 * 60 * 1000
var hoursms = 60 * 60 * 1000
var Secondms = 60 * 1000
var microsecond = 1000 
function mys(id){return document.getElementById(id)}
function clock()
{
var time = new Date()
var hour = time.getHours()
var minute = time.getMinutes()
var second = time.getSeconds()
var timenow=time.getYear()+"-"+(time.getMonth()+1)+"-"+time.getDate();
mys("time_now").innerHTML=timenow
// document.formnow.now.value = timevalue
var convertHour = DifferenceHour
var convertMinute = DifferenceMinute
var convertSecond = DifferenceSecond
var Diffms = Tday.getTime() - time.getTime()
DifferenceHour = Math.floor(Diffms / daysms)
Diffms -= DifferenceHour * daysms
DifferenceMinute = Math.floor(Diffms / hoursms)
Diffms -= DifferenceMinute * hoursms
DifferenceSecond = Math.floor(Diffms / Secondms)
Diffms -= DifferenceSecond * Secondms
var dSecs = Math.floor(Diffms / microsecond)
if(convertHour != DifferenceHour){mys("timer_d").innerHTML=DifferenceHour}
if(convertMinute != DifferenceMinute){mys("timer_h").innerHTML=DifferenceMinute} 
if(convertSecond != DifferenceSecond){mys("timer_m").innerHTML=DifferenceSecond}

mys("timer_s").innerHTML=dSecs
// document.formnow.Tnow.value= DifferenceHour DifferenceMinute + DifferenceSecond + dSecs
setTimeout("clock()",1000)
}