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 jede Sekunde
}

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 //Differenz zwischen Zieldatum und aktuell in Sekunden
if (timediff<0){
this.timesup=true
this.container.innerHTML=this.formatresults()
return
}
var oneMinute=60 //Minuten in Sekunden
var oneHour=60*60 //Stunden in Sekunden
var oneDay=60*60*24 //Tage in Sekunden
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"){
hourfield=dayfield*24+hourfield
dayfield="n/a"
}
else if (this.baseunit=="minutes"){
minutefield=dayfield*24*60+hourfield*60+minutefield
dayfield=hourfield="n/a"
}
else if (this.baseunit=="seconds"){
var secondfield=timediff
dayfield=hourfield=minutefield="n/a"
}
this.container.innerHTML=this.formatresults(dayfield, hourfield, minutefield, secondfield)
setTimeout(function(){thisobj.showresults()}, 1000) //Update jede Sekunde
}

function formatresults(){
if (this.timesup==false){//Ausgabe der Dauer bis zum Zieldatum
var displaystring="<span class='countdown'>"+arguments[0]+" Tage "+arguments[1]+" Stunden "+arguments[2]+" Minuten "+arguments[3]+" Sekunden</span>"
}
else{ //Ausgabe, wenn Datum erreicht
var displaystring="Aktion abgelaufen!"
}
return displaystring
}