function CalcMonthly() {
	var Principal = parseFloat(document.mortgagecalc.home_price.value);
	var DownPay = parseFloat(document.mortgagecalc.downpayment.value);
	var LoanTerm = parseFloat(document.mortgagecalc.loanterm.value);
	var Percent = parseFloat(document.mortgagecalc.interest.value);
	var resultval;
	var Monthly;
	
	LoanTerm = LoanTerm * -12;
	Percent = Percent / 100 / 12;
	
	resultval = 1-Math.pow(1+Percent, LoanTerm);
	resultval = Percent/resultval;
	resultval = (Principal-DownPay)*resultval;
	resultval = Math.round(resultval*100);
	Monthly = resultval/100;
	Monthly = Monthly.toString();
	Monthly = "Monthly Payment: $" + Monthly;
	document.getElementById("monthly").innerHTML = Monthly;
}

function findpayment(string){
	var amount = string;
	document.mortgagecalc.home_price.value = amount;
	amount = parseFloat(amount)*0.2;
	document.mortgagecalc.downpayment.value = amount;
	if (document.mortgagecalc.loanterm.value == "") document.mortgagecalc.loanterm.value = "30";
	if (document.mortgagecalc.interest.value == "") document.mortgagecalc.interest.value = "5";
	CalcMonthly();
}