// JavaScript Document

function updateResults() {
	if (document.frmCalc.txtAmount.value != '' && document.frmCalc.txtTerm.value != '' && document.frmCalc.txtRate.value != '') {
		calculateMortgage();
	}
	return false;
}

function getMonths() {
	var time_type = document.frmCalc.sltPeriod.selectedIndex;
	var	months = document.frmCalc.txtTerm.value;
	months = (time_type == 1) ? months * 12 : months;
	return months;
}

var xmlHttp;

function calculateMortgage() {
	
	xmlHttp = GetXmlHttpObject();
	
	if (xmlHttp == null) {
		alert ("Please make sure you have javascript enabled.");
		return;
	} 
	
	var url = "../tools/calculators/mortgageCalculate.asp";
	url = url + "?amount=" + document.frmCalc.txtAmount.value;
	url = url + "&months=" + getMonths();
	url = url + "&rate=" + document.frmCalc.txtRate.value;
	url = url + "&sid=" + Math.random();
	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);

}

function stateChanged() {
	if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
		if (xmlHttp.responseText != '') {
			document.getElementById("PaymentResult").innerHTML = xmlHttp.responseText;
			
		}
	} 
} 
	
function GetXmlHttpObject() { 

	var objXMLHttp = null;
	
	if (window.XMLHttpRequest) {
		objXMLHttp = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	return objXMLHttp;
}