function calculate() {
var price = document.getElementById('purchaseprice').value;
var down = document.getElementById('downpayment').value;
var loanterm = document.getElementById('loanterm').value;
var interest = document.getElementById('interest').value;
var realinterest = interest/100;
var city = document.getElementById('citytax').value;
var county = document.getElementById('countytax').value;

var payments = [(price - down) * Math.pow(1+(realinterest/12),loanterm * 12) * (realinterest/12)]/[Math.pow(1+(realinterest/12),loanterm * 12) - 1];
var payment1 = CurrencyFormatted(payments);
var payment = CommaFormatted(payment1);
var tax = ((((price - down) * city)/12000) + (((price - down) * county)/12000));
var totaltax = CommaFormatted(CurrencyFormatted(((((price - down) * city)/12000) + (((price - down) * county)/12000))));
var total = CommaFormatted(CurrencyFormatted((parseFloat(payments + tax))));

document.getElementById('bill').value = "$" + payment;
document.getElementById('monthlytax').value = "$" + totaltax;
document.getElementById('payments').value = "$" + total;
}

function CommaFormatted(amount){
	var delimiter = ","; // replace comma if desired
	var a = amount.split('.',2)
	var d = a[1];
	var i = parseInt(a[0]);
	if(isNaN(i)) { return ''; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	var n = new String(i);
	var a = [];
	while(n.length > 3)
	{
		var nn = n.substr(n.length-3);
		a.unshift(nn);
		n = n.substr(0,n.length-3);
	}
	if(n.length > 0) { a.unshift(n); }
	n = a.join(delimiter);
	if(d.length < 1) { amount = n; }
	else { amount = n + '.' + d; }
	amount = minus + amount;
	return amount;
}
function CurrencyFormatted(amount){
	var i = parseFloat(amount);
	if(isNaN(i)) { i = 0.00; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	i = parseInt((i + .005) * 100);
	i = i / 100;
	s = new String(i);
	if(s.indexOf('.') < 0) { s += '.00'; }
	if(s.indexOf('.') == (s.length - 2)) { s += '0'; }
	s = minus + s;
	return s;
}

function setValue(county, city){
         document.getElementById('citytax').value = city;
         document.getElementById('countytax').value = county;
}