Stopwatch

<script type="text/javascript">
var flagclock = 0;
var flagstop = 0;
var stoptime = 0;
var splitcounter = 0;
var currenttime;
var splitdate = '';
var output;
var clock;
	
function startstop()
	{
	var startstop = document.getElementById('startstopbutton');
	var startdate = new Date();
	var starttime = startdate.getTime();
	if(flagclock==0)
		{
		startstop.value = 'Stop';
		flagclock = 1;
		counter(starttime);
		}
	else
		{
		startstop.value = 'Start';
		flagclock = 0;
		flagstop = 1;
		splitdate = '';
		}
	}
	
function counter(starttime)
	{
	output = document.getElementById('output');
	clock = document.getElementById('clock');
	currenttime = new Date();
	var timediff = currenttime.getTime() - starttime;
	if(flagstop == 1)
		{
		timediff = timediff + stoptime
		}
	if(flagclock == 1)
		{
		clock.value = formattime(timediff,'');
		refresh = setTimeout('counter(' + starttime + ');',10);
		}
	else
		{
		window.clearTimeout(refresh);
		stoptime = timediff;
		}
	}
	
function formattime(rawtime,roundtype)
	{
	if(roundtype == 'round')
		{
		var ds = Math.round(rawtime/100) + '';
		}
	else
		{
		var ds = Math.floor(rawtime/100) + '';		
		}
	var sec = Math.floor(rawtime/1000);
	var min = Math.floor(rawtime/60000);
	ds = ds.charAt(ds.length - 1);
	if(min >= 60)
		{
		startstop();
		}
	sec = sec - 60 * min + '';
	if(sec.charAt(sec.length - 2) != '')
		{
		sec = sec.charAt(sec.length - 2) + sec.charAt(sec.length - 1);
		}
	else
		{
		sec = 0 + sec.charAt(sec.length - 1);
		}	
	min = min + '';
	if(min.charAt(min.length - 2) != '')
		{
		min = min.charAt(min.length - 2)+min.charAt(min.length - 1);
		}
	else
		{
		min = 0 + min.charAt(min.length - 1);
		}
	return min + ':' + sec + ':' + ds;
	}
	
function resetclock()
	{
	flagstop = 0;
	stoptime = 0;
	splitdate = '';
	window.clearTimeout(refresh);
	output.value = '';
	splitcounter = 0;
	if(flagclock == 1)
		{
		var resetdate = new Date();
		var resettime = resetdate.getTime();
		counter(resettime);
		}
	else
		{
		clock.value = "00:00:0";
		}
	}
	
function splittime()
	{
	if(flagclock == 1)
		{
		if(splitdate != '')
			{	
			var splitold = splitdate.split(':');
			var splitnow = clock.value.split(':');
			var numbers = new Array();
			var i = 0
			for(i;i<splitold.length;i++)
				{
				numbers[i] = new Array();
				numbers[i][0] = parseInt(splitold[i]);
				numbers[i][1] = parseInt(splitnow[i]);
				}
			if(numbers[1][1] < numbers[1][0])
				{
				numbers[1][1] += 60;
				numbers[0][1] -= 1;
				}
			if(numbers[2][1] < numbers[2][0])
				{
				numbers[2][1] += 10;
				numbers[1][1] -= 1;
				}
			var mzeros = (numbers[0][1] - numbers[0][0]) < 10?'0':'';
			var szeros = (numbers[1][1] - numbers[1][0]) < 10?'0':'';
			output.value += '\t+' + mzeros + (numbers[0][1] - numbers[0][0]) + ':' + szeros + (numbers[1][1] - numbers[1][0]) + ':' + (numbers[2][1] - numbers[2][0]) + '\n';
			}
		splitdate = clock.value;
		output.value += splitcounter + 1 + '. ' + clock.value + '\n';
		splitcounter ++;
		}
	}
</script>