function cdtime(container, targetdate){
	if (!document.getElementById || !document.getElementById(container)) return
	this.container = document.getElementById(container)
	this.currentTime = new Date()
	this.targetdate = new Date(targetdate)
	this.timesup = false
	this.updateTime()
}

cdtime.prototype.updateTime = function(){
	var thisobj = this
	this.currentTime.setSeconds(this.currentTime.getSeconds() + 1)
	setTimeout(function(){thisobj.updateTime()}, 1000) //update time every second
}

cdtime.prototype.displaycountdown = function(baseunit, functionref){
	this.baseunit = baseunit
	this.formatresults = functionref
	this.showresults()
}

cdtime.prototype.showresults = function(){
	var thisobj = this

	var timediff = (this.targetdate - this.currentTime) / 1000 //difference btw target date and current date, in seconds
	if (timediff < 0){ //if time is up
		this.timesup = true
		this.container.innerHTML = this.formatresults()
		return
	}
	
	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"
	}
	this.container.innerHTML = this.formatresults(dayfield, hourfield, minutefield, secondfield)
	setTimeout(function(){thisobj.showresults()}, 1000) //update results every second
}

function formatresults(){
	if (this.timesup == false){ //if target date/time not yet met
		var displaystring = "<center>" + arguments[0] + " dias " + arguments[1] + " horas " + arguments[2] + " minutos " + arguments[3] + " segundos </center>"
	}
	else{ //else if target date/time met
		var displaystring="" //Don't display any text
		alert("O Botequim foi inaugurado!") //Instead, perform a custom alert
	}
	return displaystring
}