function convert(subject) {
			return subject.replace(/,/, ".");
		}
		function calculateNetto() {
			brutto = convert(document.getElementById("brutto").value);
			document.getElementById("netto").value = Math.round(brutto * 100* 0.6)/100;
		}
		function calculateGrv() {
			brutto = convert(document.getElementById("brutto").value);
			document.getElementById("grv").value = Math.round(brutto * 100 * 0.38)/100;
		}
		function calculateLuecke() {
			netto = convert(document.getElementById("netto").value);
			grv = convert(document.getElementById("grv").value);
			document.getElementById("luecke").value = Math.round(100*(netto - grv))/100;
		}