var DifferenceHour = -1
var DifferenceMinute = -1
var DifferenceSecond = -1
var Tday = new Date("Mar 16, 2008 23:59:59")   //**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()
{
	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()
	var Diffms = time.getTime() - Tday.getTime()
	DifferenceHour = Math.floor(Diffms / daysms)
	//alert(DifferenceHour);
	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("days").value=DifferenceHour;
	}
	if(convertMinute != DifferenceMinute) 
	{
		document.getElementById("hours").value=DifferenceMinute;
	}
	if(convertSecond != DifferenceSecond) 
	{
		document.getElementById("minutes").value=DifferenceSecond;
	}
	/*if(convertHour != DifferenceHour) 
	{
		document.getElementById("days").value=DifferenceHour;
	}
	else
	{
		document.getElementById("days").value = "00";
	}
	if(convertMinute != DifferenceMinute) 
	{
		document.getElementById("hours").value=DifferenceMinute;
	}
	else
	{
		document.getElementById("hours").value= "00";
	}
	if(convertSecond != DifferenceSecond) 
	{
		document.getElementById("minutes").value=DifferenceSecond;
	}
	else
	{
		document.getElementById("minutes").value="00";
	}*/
	
	//document.formnow.ss.value=dSecs
	// document.formnow.Tnow.value= DifferenceHour DifferenceMinute + DifferenceSecond + dSecs
	setTimeout("clock()",1000)
	}