function calculate(){
	'use strict';
	var total; 
	var ilosc = document.getElementById('ilosc').value;
	var cena = document.getElementById('cena').value;
	var podatek = document.getElementById('podatek').value;
	var rabat = document.getElementById('rabat').value;
	total = ilosc * cena;
	podatek /= 100;
	podatek++;
	total *= podatek;
	podatek = podatek / 100;
	podatek = podatek + 1;
	total = total * podatek;
	total -= rabat;
	document.getElementById('total').value = total;
	return false;
}
function init(){
	'use strict';
	var theForm = document.getElementById('theForm');
	theForm.onsubmit = calculate;
}
window.onload = init;