function formatCurrency(num) {
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num))num = "0";
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100);
	cents = num%100;
	num = Math.floor(num/100).toString();
	if(cents<10)cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)num = num.substring(0,num.length-(4*i+3))+'.'+num.substring(num.length-(4*i+3));
	return (((sign)?'':'-') + num + ',' + cents);
}
var faktoren = Array(0.1713039 , 0.0876730 , 0.0598167 , 0.0459040 , 0.0375688 , 0.0320223 , 0.0280694 , 0.0251123 , 0.0228192 , 0.0209908, 0.0195003 , 0.0182633);
function cetelem_podschet(summa){
	for (i=11; i>-1; i--){
		var resultat = formatCurrency(summa*faktoren[i]);
		if (parseFloat(resultat) >= 15) {
			return "oder schon ab <span class='preis_klein'><span class='vorkomma_klein'>&euro; "+resultat+"</span>/mtl.</span>";
		}
	}
	return "";
}