ÿþfunction check(str) {
	var i = str.length;
	while (i > 0) {
		if (str.charAt(i - 1) >= '0' && str.charAt(i - 1) <= '9')
			i--;
		else if ((str.charAt(i - 1) == '.') && i > 1) {
			i--;
			while (i > 0) {
				if (str.charAt(i - 1) >= '0' && str.charAt(i - 1) <= '9')
					i--;
				else
					return true;
			}
		}
		else
			return true;
	}
	return false;
}

function calculate(form) {
	var error = false;
	var errorMessage = new Array();
	var FV = 0;
	var i = 0;
	var ref = 0;
	for (var c = 0; c < form.length; c++) {
		var e = form.elements[c];
		switch(e.name) {
		case "PV":
			var PV = Math.abs(parseFloat(e.value));
			if (isNaN(PV) || check(e.value)) {
				error = true;
				errorMessage.push("Wprowadz
 poprawn
 kwot
 wkB
adu!");
			}
			break;
		case "r":
			var r = Math.abs(parseFloat(e.value));
			if (isNaN(r) || check(e.value)) {
				error = true;
				errorMessage.push("Wprowadz
 poprawne oprocentowanie nominalne!");
			}
			r /= 100;
			break;
		case "n":
			var n = Math.abs(parseFloat(e.value));
			if (isNaN(n) || check(e.value)) {
				error = true;
				errorMessage.push("Wprowadz
 poprawn
 liczb
 miesi
cy!");
			}
			n /= 12;
			break;
		case "m":
			if (form.m[0].checked)
      			m = 12;
			else if (form.m[1].checked)
      			m = 4;
			else if (form.m[2].checked)
      			m = 2;
			else if (form.m[3].checked)
      			m = 1;
			else {
				error = true;
				errorMessage.push("Wprowadz
 poprawn
 liczb
 kapitalizacji!");
			}
			break;
		case "FV":
			var FV = c;
			break;
		case "i":
			var i = c;
			break
		case "ref":
			var ref = c;
			break
		default:
			break;
		}
	}
	if (error) {
		alert(errorMessage.join("\n"));
		form.elements[FV].value = "";
		form.elements[i].value = "";
		form.elements[ref].value = "";
		return false;
	}
	form.elements[FV].value = Math.round(100 * PV * Math.pow(1 + r / m, n * m)) / 100;
	form.elements[i].value = Math.round(100 * (form.elements[FV].value - PV)) / 100;
	form.elements[ref].value = Math.round(10000 * (Math.pow(1 + (r / m), m) - 1)) / 100;
	return false;	//zmieD
 na true je|
eli chcesz przesB
a
 na serwer
}