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
}



/////CUSTOM FORMAT OUTPUT FUNCTIONS BELOW//////////////////////////////

//Create your own custom format function to pass into cdtime.displaycountdown()
//Use arguments[0] to access "Days" left
//Use arguments[1] to access "Hours" left
//Use arguments[2] to access "Minutes" left
//Use arguments[3] to access "Seconds" left

//The values of these arguments may change depending on the "baseunit" parameter of cdtime.displaycountdown()
//For example, if "baseunit" is set to "hours", arguments[0] becomes meaningless and contains "n/a"
//For example, if "baseunit" is set to "minutes", arguments[0] and arguments[1] become meaningless etc


function formatresults()
{
	if(arguments[1]<10) arguments[1] = '0'+arguments[1];
	
	if(arguments[0]<10) arguments[0] = '00'+arguments[0];
	else if (arguments[0]<100) arguments[0] = '0'+arguments[0];
	else arguments[0]= arguments[0];
	
	if(arguments[2]<10) arguments[2] = '0'+arguments[2];
	if(arguments[3]<10) arguments[3] = '0'+arguments[3];

	if (this.timesup==false)			//if target date/time not yet met
	{
		var displaystring="<span>"+arguments[0]+"</span><span class='spanHour'>"+arguments[1]+"</span><span class='spanMinute'>"+arguments[2]+"</span><span class='spanSec'>"+arguments[3]+"</span>"
	}
	else								//else if target date/time met
	{
		var displaystring="Vindt nu plaats"; //Don't display any text
	}
	return displaystring
}


function formatresults2()
{
	if(arguments[1]<10) arguments[1] = '0'+arguments[1];
	
	if(arguments[0]<10) arguments[0] = '00'+arguments[0];
	else if (arguments[0]<100) arguments[0] = '0'+arguments[0];
	else arguments[0]= arguments[0];
	
	if(arguments[2]<10) arguments[2] = '0'+arguments[2];
	if(arguments[3]<10) arguments[3] = '0'+arguments[3];

	//arguments[1].length;
	if (this.timesup==false)			//if target date/time not yet met
	{
		var displaystring="<span>"+arguments[0]+"</span><span class='spanHour'>"+arguments[1]+"</span><span class='spanMinute'>"+arguments[2]+"</span><span class='spanSec'>"+arguments[3]+"</span>"
	}
	else								//else if target date/time met
	{
		var displaystring="" //Don't display any text
		alert("Christmas is here!") //Instead, perform a custom alert
	}
	return displaystring
}