/*
* p = principal
* ir = interest rate
* lt = loan term (years)
*/
function calculatePayment(p, ir, lt, outputId) {
	var payment = 0.0;
	var output = document.getElementById(outputId);

	payment = monthlypayment( (ir / 100) / 12, lt, p);

	if (String(payment).indexOf('.') != -1) {
		payment = String(payment).substring(0, String(payment).indexOf('.')+3);
	} else {
		payment = String(payment) + '.00';
	}
	/*if (typeof(console) && typeof(console.log) == 'function') {
		console.log("\np:$"+p+" i:"+ir+"% l:"+lt*12+" mo. PAYMENT: $"+payment);
	}*/
	if (output && typeof(output.innerHTML)) {
		output.innerHTML = payment;
	}
}
function monthlypayment(i, n, pv) {
	if ( i > 0 ) {
		var multiplier = Math.pow((1 + i), n);
		return pv * i * multiplier / (multiplier - 1);
	} else {
		return pv / n;
	}
}