Math.number_format = function(number, decimals, decPoint, thousandsSep) {
    if(typeof decPoint == "undefined")        decPoint = ",";
    if(typeof thousandsSep == "undefined")    thousandsSep = ".";
   
    tBeforeDec    = "" + Math.floor(number);
    beforeDec    = "";
    for(i=tBeforeDec.toString().length; i>=0; i--) {
        if(i != tBeforeDec.toString().length - 1 && i % 3 == 0)
            beforeDec = thousandsSep + beforeDec;
        beforeDec = tBeforeDec.charAt(i) + beforeDec;
    }
   
    afterDec    = "" + Math.round((number - tBeforeDec) * Math.pow(10, decimals));
   
   
    retVal = beforeDec + decPoint + afterDec;
           
    return retVal;
}


function change_month(wert) {
  	window.location.href = '/%D6sterreich/' + wert;
}

function berechne() {
  	npreis = document.anfrage.preis.value;
  	kpreis = document.anfrage.preis_kind.value;
  	if(document.anfrage.rabatt.value) {
  	  	rabatt = document.anfrage.rabatt.value;
  	} else {
  	  	rabatt = 0;
  	}
  	eltern = document.anfrage.anz_erwachsene.value;
  	kinder = document.anfrage.anz_kinder.value;
  	
  	kosten_erw    = npreis*eltern;
  	kosten_kinder = kpreis*kinder; 
  	
  	document.getElementById('kosten_erw').innerHTML = kosten_erw;
  	document.getElementById('kosten_kinder').innerHTML = kosten_kinder;
  	
  	if(rabatt != 0) {
  	  	rabatt = ((kosten_erw+kosten_kinder)/100)*rabatt;
  		document.getElementById('rabatt').innerHTML = rabatt, 2;
  	}
  	
  	gesamt = (kosten_erw+kosten_kinder)-rabatt;
  	document.getElementById('kosten_gesamt').innerHTML = gesamt, 2;
}