var request = null;
var netto_sum = 0;

function calculatePrices() {
	netto_sum = 0;
	var price = 0;
	var quantity = 0;
	var position = 0;
	var ajax_url = "calculatePaketpreis.php?id_land=" + document.getElementById('id_land').value;
		price = document.getElementById("order_price_45").value;
	quantity = document.getElementById("order_quantity_45").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product45=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_45").value = kaufm(position);
		price = document.getElementById("order_price_44").value;
	quantity = document.getElementById("order_quantity_44").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product44=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_44").value = kaufm(position);
		price = document.getElementById("order_price_43").value;
	quantity = document.getElementById("order_quantity_43").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product43=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_43").value = kaufm(position);
		price = document.getElementById("order_price_40").value;
	quantity = document.getElementById("order_quantity_40").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product40=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_40").value = kaufm(position);
		price = document.getElementById("order_price_39").value;
	quantity = document.getElementById("order_quantity_39").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product39=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_39").value = kaufm(position);
		price = document.getElementById("order_price_42").value;
	quantity = document.getElementById("order_quantity_42").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product42=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_42").value = kaufm(position);
		price = document.getElementById("order_price_49").value;
	quantity = document.getElementById("order_quantity_49").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product49=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_49").value = kaufm(position);
		price = document.getElementById("order_price_41").value;
	quantity = document.getElementById("order_quantity_41").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product41=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_41").value = kaufm(position);
		price = document.getElementById("order_price_48").value;
	quantity = document.getElementById("order_quantity_48").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product48=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_48").value = kaufm(position);
		price = document.getElementById("order_price_47").value;
	quantity = document.getElementById("order_quantity_47").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product47=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_47").value = kaufm(position);
		price = document.getElementById("order_price_46").value;
	quantity = document.getElementById("order_quantity_46").value;
	position = price*quantity;
	ajax_url = ajax_url + "&_product46=" + quantity;
	netto_sum = netto_sum + position;
	document.getElementById("order_position_46").value = kaufm(position);
		ajax(ajax_url);
}

function calculatePricesAjaxHandler() {
	switch(request.readyState)    
	{
		case 0:
		case 1:
		case 2: 
		case 3: return;
		case 4: var versand_gebuehr = request.responseText; break;
	}
	versand_gebuehr = parseFloat(versand_gebuehr);
	document.getElementById("order_sum_netto").value = kaufm(netto_sum);
	var ust = netto_sum*0.2;
	document.getElementById("order_sum_ust").value = kaufm(ust);
	document.getElementById("order_sum_brutto").value = kaufm(netto_sum + ust);
	document.getElementById('order_versand_gebuehr').value = kaufm(versand_gebuehr);
	if((netto_sum + ust) < 40 && netto_sum > 0) {
		document.getElementById("order_sum_gebuehr").value = kaufm(5);
		document.getElementById("order_sum_all").value = kaufm(netto_sum + ust + 5 + versand_gebuehr);
	} else {
		document.getElementById("order_sum_gebuehr").value = kaufm(0);
		document.getElementById("order_sum_all").value = kaufm(netto_sum + ust + versand_gebuehr);
	}
}

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

function ajax(url)  //der onclick Event wird nach dem Laden des Dokuments an den Tag "button angehängt
{
    request = createRequest(); //funktion zum erstellen des XMLHttpRequest Objekts
    request.onreadystatechange = calculatePricesAjaxHandler; //Keine Klammern() da sonnst die Funktion ausgeführt wird; Sie soll aber nur verknüpft werden
    request.open("GET", url , true);
	request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=iso-8859-1');
	//request.setMimeType('Content-Type','text/html; charset=ISO-8859-1');
    request.send(null);  // die übergabe eines Wertes ist in diesem Fall sehr wichtig, da sonnst inkompatibilitäten auftreten könnten
}

function createRequest()
{
 	try
	{
		var request = new XMLHttpRequest();
	}
	catch(ex)
	{
		try
		{
			var request = new ActiveXObject("MSXML2.XMLHTTP");
		}
		catch(ex)
		{
			var request = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return request;
}