var timercount = 0;
var timestart  = null;

function timerShow(id) {
	if(timercount) {
		clearTimeout(timercount);
		clockID = 0;
	}
	if(!timestart){
		timestart = new Date();
	}
	var timeend = new Date();
	var timedifference = timeend.getTime() - timestart.getTime();
	timeend.setTime(timedifference);
	var minutes_passed = timeend.getMinutes();
	if(minutes_passed < 10){
		minutes_passed = "0" + minutes_passed;
	}
	var seconds_passed = timeend.getSeconds();
	if(seconds_passed < 10){
		seconds_passed = "0" + seconds_passed;
	}
	document.getElementById(id).value = minutes_passed + ":" + seconds_passed;
	timercount = setTimeout("timerShow('" + id + "')", 1000);
}

function timerStart(id){
	if(!timercount){
	timestart   = new Date();
	document.getElementById(id).value = "00:00";
	//document.timeform.laptime.value = "";
	timercount  = setTimeout("timerShow('" + id + "')", 1000);
	}
	else{
		var timeend = new Date();
		var timedifference = timeend.getTime() - timestart.getTime();
		timeend.setTime(timedifference);
		var minutes_passed = timeend.getMinutes();
		if(minutes_passed < 10){
			minutes_passed = "0" + minutes_passed;
		}
		var seconds_passed = timeend.getSeconds();
		if(seconds_passed < 10){
			seconds_passed = "0" + seconds_passed;
		}
		var milliseconds_passed = timeend.getMilliseconds();
		if(milliseconds_passed < 10){
			milliseconds_passed = "00" + milliseconds_passed;
		}
		else if(milliseconds_passed < 100){
			milliseconds_passed = "0" + milliseconds_passed;
		}
		//document.timeform.laptime.value = minutes_passed + ":" + seconds_passed + "." + milliseconds_passed;
	}
}

function timerStop(id) {
	if(timercount) {
		clearTimeout(timercount);
		timercount  = 0;
		var timeend = new Date();
		var timedifference = timeend.getTime() - timestart.getTime();
		timeend.setTime(timedifference);
		var minutes_passed = timeend.getMinutes();
		if(minutes_passed < 10){
			minutes_passed = "0" + minutes_passed;
		}
		var seconds_passed = timeend.getSeconds();
		if(seconds_passed < 10){
			seconds_passed = "0" + seconds_passed;
		}
		var milliseconds_passed = timeend.getMilliseconds();
		if(milliseconds_passed < 10){
			milliseconds_passed = "00" + milliseconds_passed;
		}
		else if(milliseconds_passed < 100){
			milliseconds_passed = "0" + milliseconds_passed;
		}
		document.getElementById(id).value = minutes_passed + ":" + seconds_passed ;//+ "." + milliseconds_passed;
	}
	timestart = null;
}

function timerReset(id) {
	timestart = null;
	document.getElementById(id).value = "00:00";
	//document.timeform.laptime.value = "";
}