function dcountup(startingdate, baseunit){
	this.currentTime=new Date()
	this.startingdate=new Date(startingdate)
	this.timesup=false
	this.baseunit=baseunit
	this.firststart=true
	this.start()
}

dcountup.prototype.oncountup=function(){ } //default action for "oncountup"

dcountup.prototype.start=function(){
	var thisobj=this
	this.currentTime.setSeconds(this.currentTime.getSeconds()+1)
	var timediff=(this.currentTime-this.startingdate)/1000 //difference btw target date and current date, in seconds

	if(timediff <= 0 )
		timediff=(this.startingdate-this.currentTime)/1000 //difference btw target date and current date, in seconds
	
	var oneMinute=60 //minute unit in seconds
	var oneHour=60*60 //hour unit in seconds
	var oneDay=60*60*24 //day unit in seconds
	var dayfield=Math.floor(timediff/oneDay)
	var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour)
	var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute)
	var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute))
		
	/*if (this.baseunit=="hours"){ //if base unit is hours, set "hourfield" to be topmost level
		hourfield=dayfield*24+hourfield
		dayfield="n/a"
	}
	else if (this.baseunit=="minutes"){ //if base unit is minutes, set "minutefield" to be topmost level
		minutefield=dayfield*24*60+hourfield*60+minutefield
		dayfield=hourfield="n/a"
	}
	else if (this.baseunit=="seconds"){ //if base unit is seconds, set "secondfield" to be topmost level
		var secondfield=timediff
		dayfield=hourfield=minutefield="n/a"
	}*/
	
	if( dayfield < 100 ) dayfield = '0' + dayfield;
	if( dayfield < 10 ) dayfield = '0' + dayfield;
	if( hourfield < 10 ) hourfield = '0' + hourfield;
	if( minutefield < 10 ) minutefield = '0' + minutefield;
	//if( secondfield < 10 ) secondfield = '0' + secondfield;
	
	var result={days: dayfield, hours:hourfield, minutes:minutefield, seconds:secondfield}
	this.oncountup(result)
	
	setTimeout(function(){thisobj.start()}, 1000) //update results every second
}

var countdown=new dcountup("september 8, 2010 00:00:00", "days")
	countdown.oncountup=function(result){
	$("days").setText(result['days']);
	$("hour").setText(result['hours']);
	$("min").setText(result['minutes']);
}