function calcpricest() {
	var subtotal;
	var sendcost = 17;
	subtotal = parseInt(document.bestel.st1.value);
	document.bestel.st2.value = sendcost + subtotal;
}
function calcbtw() {
	var btwint	=	0.19;
	var subtotal;
	subtotal = parseInt(document.bestel.st2.value) * btwint;
	//btwvalue = Math.round(subtotal);
	btwvalue = subtotal;	
    document.bestel.btw.value = number_format(btwvalue,2,',','');	
}
function calctotalprice() {
	var prijsvalue;
	var btw;
	var btwint	=	0.19;
	var subtotal;
	var sendcost = 17;
	prijsvalue = parseFloat(document.bestel.st2.value);
	btw = document.bestel.btw.value;
	btw = btw.replace(',','.');
	btw = parseFloat(btw);
	document.bestel.kostprijs.value = number_format((prijsvalue + btw),2,',','');
	mydiscount = document.bestel.discount.value;
	subtotal = parseInt(document.bestel.st1.value);	
	mydiscount = number_format(((subtotal)*(1-mydiscount)),2,',','');
	//alert ((parseFloat(mydiscount)+17) * parseFloat((1+btwint)));
	document.bestel.specialprijs.value = number_format(((parseFloat(mydiscount)+17) * parseFloat(1+btwint)),2,',','');
}