startclock()
var timerID = null;
var timerRunning = false;
function ShowTime(){
	BirthDay=new Date("August,08,2008");//计时日期
	today=new Date();
	timeold=(today.getTime()-BirthDay.getTime());
	sectimeold=timeold/1000
	secondsold=Math.floor(sectimeold);
	msPerDay=24*60*60*1000
	e_daysold=timeold/msPerDay
	daysold=Math.floor(e_daysold);

	var sTmp = "<font color=#ff0000><font size=3><b>第"+daysold+"天</b></font></font>";
	window.aa.innerHTML = sTmp;
	timerID = setTimeout("ShowTime();",1000);
	timerRunning = true;
}

function stopclock () {
if(timerRunning)
clearTimeout(timerID);
timerRunning = false;
}
function startclock () {
stopclock();
ShowTime();
}