function calculatePrices() {
	var nettoSum = 0;
	// 6-er
	if(document.getElementById("klappen_6er").checked) {
		document.getElementById("preis_6er_fach").innerText = "29.50";
		document.getElementById("preis_6er").innerText = "177.00";
		document.getElementById("preis_6er_fach").innerHTML = "29.50";
		document.getElementById("preis_6er").innerHTML = "177.00";
	} else {
		document.getElementById("preis_6er_fach").innerText = "26.50";
		document.getElementById("preis_6er").innerText = "159.00";
		document.getElementById("preis_6er_fach").innerHTML = "26.50";
		document.getElementById("preis_6er").innerHTML = "159.00";
	}
	var menge_6er = parseInt(document.getElementById("menge_6er").value);
	var position_6er = menge_6er * parseFloat(document.getElementById("preis_6er").innerText);
	document.getElementById("position_6er").value = kaufm(position_6er);
	nettoSum += position_6er;
	// 2-er
	if(document.getElementById("klappen_2er").checked) {
		document.getElementById("preis_2er_fach").innerText = "32.50";
		document.getElementById("preis_2er").innerText = "65.00";
		document.getElementById("preis_2er_fach").innerHTML = "32.50";
		document.getElementById("preis_2er").innerHTML = "65.00";
	} else {
		document.getElementById("preis_2er_fach").innerText = "29.50";
		document.getElementById("preis_2er").innerText = "59.00";
		document.getElementById("preis_2er_fach").innerHTML = "29.50";
		document.getElementById("preis_2er").innerHTML = "59.00";
	}
	var menge_2er = parseInt(document.getElementById("menge_2er").value);
	var position_2er = menge_2er * parseFloat(document.getElementById("preis_2er").innerText);
	document.getElementById("position_2er").value = kaufm(position_2er);
	nettoSum += position_2er;
	// 3er-jumbo
	document.getElementById("preis_3jumbo").innerText = "149.50";
	document.getElementById("preis_3jumbo").innerHTML = "149.50";
	var menge_3jumbo = parseInt(document.getElementById("menge_3jumbo").value);
	var position_3jumbo = menge_3jumbo * parseFloat(document.getElementById("preis_3jumbo").innerText);
	document.getElementById("position_3jumbo").value = kaufm(position_3jumbo);
	nettoSum += position_3jumbo;
	// 1er-jumbo
	document.getElementById("preis_jumbo").innerText = "52.50";
	document.getElementById("preis_jumbo").innerHTML = "52.50";
	var menge_jumbo = parseInt(document.getElementById("menge_jumbo").value);
	var position_jumbo = menge_jumbo * parseFloat(document.getElementById("preis_jumbo").innerText);
	document.getElementById("position_jumbo").value = kaufm(position_jumbo);
	nettoSum += position_jumbo;
	// 1er-hoch
	document.getElementById("preis_1er").innerText = "38.50";
	document.getElementById("preis_1er").innerHTML = "38.50";
	var menge_1er = parseInt(document.getElementById("menge_1er").value);
	var position_1er = menge_1er * parseFloat(document.getElementById("preis_1er").innerText);
	document.getElementById("position_1er").value = kaufm(position_1er);
	nettoSum += position_1er;
	// schutzdach
	document.getElementById("preis_schutz").innerText = "46.50";
	document.getElementById("preis_schutz").innerHTML = "46.50";
	var menge_schutz = parseInt(document.getElementById("menge_schutz").value);
	var position_schutz = menge_schutz * parseFloat(document.getElementById("preis_schutz").innerText);
	document.getElementById("position_schutz").value = kaufm(position_schutz);
	nettoSum += position_schutz;
	// versand
	var position_versand_post = 0;
	var position_versand_montagefirma = 0;
	if(document.getElementById("versand_selbstabholung").checked) {
		document.getElementById("position_versand_post").value = "0.00";
		document.getElementById("position_versand_montagefirma").value = "0.00";
	} else if (document.getElementById("versand_post").checked) {
		position_versand_post = (menge_6er+menge_3jumbo)*10+(menge_2er+menge_jumbo+menge_schutz+menge_1er)*6; 
		document.getElementById("position_versand_post").value = kaufm(position_versand_post);
		document.getElementById("position_versand_montagefirma").value = "0.00";
	} else {
		document.getElementById("position_versand_post").value = "0.00";
		var menge_gesamt = menge_6er+menge_3jumbo+menge_2er+menge_jumbo+menge_schutz+menge_1er;
		position_versand_montagefirma = Math.ceil(menge_gesamt / 10) * 44;
		document.getElementById("position_versand_montagefirma").value = kaufm(position_versand_montagefirma);
	}
	nettoSum += position_versand_post;
	nettoSum += position_versand_montagefirma;
	// montage
	var position_montage = 0;
	if(document.getElementById("montage").checked) {
		position_montage = (menge_6er+menge_3jumbo+menge_2er+menge_jumbo)*12.5+(menge_schutz+menge_1er)*7;
		nettoSum += position_montage;
	}
	document.getElementById("position_montage").value = kaufm(position_montage);
	// demontage
	var position_demontage = 0;
	if(document.getElementById("demontage").checked) {
		position_demontage = document.getElementById("menge_demontage").value * 3.9;
		nettoSum += position_demontage;
	}
	document.getElementById("position_demontage").value = kaufm(position_demontage);
	// netto sum
	document.getElementById("nettoSum").value = kaufm(nettoSum);
}

function kaufm(x) {
  	var k = (Math.round(x * 100) / 100).toString();
  	k += (k.indexOf('.') == -1)? '.00' : '00';
  	return k.substring(0, k.indexOf('.') + 3);
}