<!--倒计时-->

var DifferenceHour = -1
var DifferenceMinute = -1
var DifferenceSecond = -1
var Tday = new Date("OCT 15, 2010 20:00:00")   //**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 clock(){
	try{ 
		var time = new Date()
		var hour = time.getHours()
		var minute = time.getMinutes()
		var second = time.getSeconds()
		var timevalue = ""+((hour > 12) ? hour-12:hour)
		timevalue +=((minute < 10) ? ":0":":")+minute
		timevalue +=((second < 10) ? ":0":":")+second
		timevalue +=((hour >12 ) ? " PM":" AM")
		// 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) document.getElementById("ddd").innerHTML=DifferenceHour
		if(convertMinute != DifferenceMinute) document.getElementById("dhh").innerHTML=DifferenceMinute
		if(convertSecond != DifferenceSecond) document.getElementById("dmm").innerHTML=DifferenceSecond
		document.getElementById("dss").innerHTML=dSecs

		// document.formnow.Tnow.value= DifferenceHour DifferenceMinute + DifferenceSecond + dSecs
		setTimeout("clock()",1000)
	}catch(e){  
	}
} 
// end hidin
<!--倒计时-->