function floor(number) {
	return Math.floor(number*Math.pow(10,2))/Math.pow(10,2);
}
function dosum() {
	var mi = document.temps.IR.value / 1200;
	var base = 1;
	var mbase = 1 + mi;
	for (i=0; i<document.temps.YR.value * 12; i++) {
		base = base * mbase
	}
	document.temps.PI.value = floor(document.temps.LA.value * mi / ( 1 - (1/base)))
	//document.temps.MT.value = floor(document.temps.AT.value / 12)
	//document.temps.MI.value = floor(document.temps.AI.value / 12)
	var dasum = document.temps.LA.value * mi / ( 1 - (1/base)) +
	document.temps.AT.value / 12 + 
	document.temps.AI.value / 12;
	//document.temps.MP.value = floor(dasum);
}
function checkNumber(input, min, max, msg) {
	msg = msg + " field has invalid data: " + input.value;
	var str = input.value;
	for (var i = 0; i < str.length; i++) {
		var ch = str.substring(i, i + 1)
		if ((ch < "0" || ch > "9") && ch != '.') {
			alert(msg);
			return false;
		}
	}
	var num = parseFloat(str)
	if (num < min || num > max) {
		alert(msg + " not in the range " + min + " to " + max);
		return false;
	}
	input.value = str;
	return true;
}
function computeField(input) {
	if (input.value != null && input.value.length != 0)
		input.value = "" + eval(input.value);
	computeForm(input.form);
}
function computeForm(form) {
	if (form.payments.value == null ||
	form.payments.value.length == 0 ||
	form.interest.value == null ||
	form.interest.value.length == 0 ||
	form.principal.value == null ||
	form.principal.value.length == 0)
	return;
	if (!checkNumber(form.principal, 100, 9999999, "Principal") ||
	!checkNumber(form.payments, 1, 480, "Number of Payments") ||
	!checkNumber(form.interest, .001, 99, "Interest")) {
		form.payment.value = "Invalid"; return;
	}
	var i = form.interest.value;
	if (i < 1) {
		i *= 100;    form.interest.value = i;
	}
	i /= 1200;
	var pow = 1;
	for (var j = 0; j < form.payments.value; j++)
		pow = pow * (1 + i);
	monthly = (form.principal.value * pow * i) / (pow - 1)
	form.payment.value = Math.ceil(100 * monthly)/100
}
function clearForm(form) {
	form.principal.value = "";
	form.payments.value = "";
	form.interest.value = "";
}

var i = 0; // interest
var m = 0; // months
var f = 0; // factor
var den = 0; 
var s = "0"; // string
var d = 0; // decimal place
function CalcA() {
	if(document.calform.interest.value=="" || document.calform.months.value=="" || document.calform.payment.value=="") {
		alert("Please fill in all of the required fields.");
	} else { 
		if(document.calform.period.options[1].selected == true) {
			m = document.calform.months.value * 12;
		} else {
			m = document.calform.months.value;
		} 
		i = Math.pow(((document.calform.interest.value/100)+1),.0833333)-1;
		den = i / (i+1);
		f = Math.pow((i+1),m)-1;
		f /= den;
		f *= document.calform.payment.value;
		d = String(f).indexOf(".");
		s = String(f).substring(0,(d+3));
		document.calform.total.value = "$" + s;  
	}
}
function cwCalc() { 
	if (cwBalance.value=='') {alert('Please enter your credit card balance.'); return;} 
	if (cwRate.value=='') {alert('Please enter your credit card\'s interest rate.'); return;} 
	if ( (cwMonthlyAmount.value=='' && cwDesiredMonths.value=='') || (cwMonthlyAmount.value!='' && cwDesiredMonths.value!='') ) {alert('Please enter either a payment amount or desired months.'); return;}
	var mRate=(cwRate.value/100)/12; 
	if (cwMonthlyAmount.value=='') { 
		var payment=cwBalance.value*(mRate)/( 1-Math.pow((1+mRate),(-cwDesiredMonths.value)) ); 
		payment=Math.round(payment*100)/100; 
		cwResult.innerHTML="It will cost $" + payment.toFixed(2) + " a month to pay off this card and will cost you a total of $" + (payment*cwDesiredMonths.value).toFixed(2) + ".";
	} else { 
		var remainingBalance=cwBalance.value; 
		var minPayment=mRate*cwBalance.value; 
		var months=0; 
		var lastPayment; 
		if (minPayment>cwMonthlyAmount.value) {alert ('Your monthly payment is less than the monthly interest charged by this card.');return;}
		while (remainingBalance>0) { 
			months++; 
			remainingBalance=remainingBalance*(1 + mRate)-cwMonthlyAmount.value; 
		} 
		cwResult.innerHTML="It will take " + months + " months to pay off this card and will cost you a total of $" + (cwMonthlyAmount.value*months).toFixed(2) + ".";
	} 
} 
function Loan() {
	var housePrice;
	var IR;
	var dpayment;
	var years;
	var monthPay;
	var month;
	switch(document.calcform.startm.value) {
		case "january":
		document.calcform.startm.value="0";
		parseInt(document.calcform.startm.value)
		break;
		case "february":
		document.calcform.startm.value="1";
		parseInt(document.calcform.startm.value)
		break;
		case "march":
		document.calcform.startm.value="2";
		parseInt(document.calcform.startm.value);
		break;
		case "april":
		document.calcform.startm.value="3";
		parseInt(document.calcform.startm.value);
		break;
		case "may":
		document.calcform.startm.value="4";
		parseInt(document.calcform.startm.value);
		break;
		case "june":
		document.calcform.startm.value="5";
		parseInt(document.calcform.startm.value);
		break;
		case "july":
		document.calcform.startm.value="6";
		parseInt(document.calcform.startm.value);
		break;
		case "august":
		document.calcform.startm.value="7";
		parseInt(document.calcform.startm.value);
		break;
		case "september":
		document.calcform.startm.value="8";
		parseInt(document.calcform.startm.value);
		break;
		case "october":
		document.calcform.startm.value="9";
		parseInt(document.calcform.startm.value);
		break;
		case "november":
		document.calcform.startm.value="10";
		parseInt(document.calcform.startm.value);
		break;
		case "december":
		document.calcform.startm.value="11";
		parseInt(document.calcform.startm.value);
		break;
		default:
		document.calcform.startm.value="0";
		parseInt(document.calcform.startm.value);
		break;
	}
	housePrice = parseFloat(document.calcform.price.value);
	dpayment = parseFloat(document.calcform.dpayment.value);
	IR = parseFloat(document.calcform.interest.value);
	years = parseFloat(document.calcform.time.value);
	housePrice = housePrice - dpayment;
	month = years * 12;
	interestRate = IR / 12;
	negmonth =- 1 * month;
	var bottom = 1 - (Math.pow(interestRate+1,negmonth));
	var top = interestRate;
	var mid = top / bottom;
	var dec;
	document.calcform.monthPay.value = (housePrice * mid);
	monthPay = document.calcform.monthPay.value;
	document.calcform.monthPay.value = eval(monthPay);
	housePrice = housePrice - document.calcform.monthPay.value;
	document.calcform.month.value = month;
}
function convert() {
	var startmonth = new String();
	startmonth = document.calcform.startm.value;
	document.calcform.startm.value = startmonth.toLowerCase();
}
function changenum() {
	document.calcform.startyear.value=parseInt(document.calcform.startyear.value);
}
var d = new Date;

function getFieldValue (strFieldName) {
	var strFieldValue;
	var objRegExp = new RegExp(strFieldName + "=([^&]+)","gi");
	if (objRegExp.test(location.search))
		strFieldValue = unescape(RegExp.$1);
	else strFieldValue="";
	return strFieldValue;
}
function Currency(money1) {
	var money = new String(money1);
	var decimal = money.indexOf(".",[0]);
	var money = money.substring(0,decimal+3);
	var money1 = parseFloat(money);
	return money;
}
var startmonth;
startmonth = getFieldValue("startm");
var monthofpayment = new String;
month = getFieldValue("month");
monthPay = getFieldValue("monthPay");
Houseprice = getFieldValue("price");
Ir = getFieldValue("interest");
Ir = Ir/12;
year = getFieldValue("startyear")
function check() {
	var dPayment = document.calcform.dpayment.value;
	var price = document.calcform.price.value;
	if(price.indexOf(",") >= 0) {
		alert("Please do not put commas in the Price number")
	}
}
function check1() {
	var dPayment = document.calcform.dpayment.value;
	if(dPayment.indexOf(",") >= 0) {
		alert("Please do not put commas in the Down Payment number");
	}
}