function calculate() {
    // Get the user's input from the form. Assume it is all valid.
    // Convert interest from a percentage to a decimal, and convert from
    // an annual rate to a monthly rate. Convert payment period in years
    // to the number of monthly payments.
    var principal = document.loandata.principal.value;
    var interest = document.loandata.interest.value / 100 / 12;
    var payments = document.loandata.years.value * 12;

    // Now compute the monthly payment figure, using esoteric math.
    var x = Math.pow(1 + interest, payments);
    var monthly = (principal*x*interest)/(x-1);

    // Check that the result is a finite number. If so, display the results
    if (!isNaN(monthly) &&
        (monthly != Number.POSITIVE_INFINITY) &&
        (monthly != Number.NEGATIVE_INFINITY)) {

        document.loandata.payment.value = round(monthly);
        document.loandata.total.value = round(monthly * payments);
        document.loandata.totalinterest.value =
            round((monthly * payments) - principal);
    }
    // Otherwise, the user's input was probably invalid, so don't
    // display anything.
    else {
        document.loandata.payment.value = "";
        document.loandata.total.value = "";
        document.loandata.totalinterest.value = "";
    }
}

// This simple method rounds a number to two decimal places.
function round(x) {
  return Math.round(x*100)/100;
}


function displayLoader(where)
{
	document.getElementById(where).innerHTML = '';
	return true;
}

function displaySubmit(where)
{
	document.getElementById(where).innerHTML = '<div style="padding:30px; padding-left:15px; padding-right:15px; text-align:center; background-color:#ffffff; margin-bottom:10px;"><img src="images/ajax-loader.gif" border="0" align="absmiddle" width="50" height="50" style="margin-right:10px;"></div>';
	return true;
}

function openWindow(windowFile, windowName, w, h)
{
	//alert(w+' '+h);
	window.open(windowFile,windowName,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,height="+h+",width="+w);
}

function echeck(str)
{
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   //alert("Invalid E-mail ID")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   //alert("Invalid E-mail ID")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	    //alert("Invalid E-mail ID")
	    return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
	    //alert("Invalid E-mail ID")
	    return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	    //alert("Invalid E-mail ID")
	    return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
	    //alert("Invalid E-mail ID")
	    return false
	 }

	 if (str.indexOf(" ")!=-1){
	    //alert("Invalid E-mail ID")
	    return false
	 }
	 return true
}


/**
 *
 * @access public
 * @return void
 **/
function checkNewsletterForm(){
	if (echeck(document.nlform.emailAddress.value) == false)
	{
		alert('Invalid email address');
		return false;
	}
	else
	{
		return true;
	}
}

function checkRequestForm() {
	var alertmsg = '';
	if (document.reqPropertyInfo.rname.value == '') {
		var alertmsg = 'Please complete your name.';
		var error = 1;
	}
	if (document.reqPropertyInfo.remail.value == '' && document.reqPropertyInfo.rphone.value == '') {
		var alertmsg = alertmsg + '\nMissing contact details. Please complete either telephone number or email address.';
		var error = 1;
	}
	if (document.reqPropertyInfo.remail.value != '')
	{
		if (echeck(document.reqPropertyInfo.remail.value)==false)
		{
			var alertmsg = alertmsg + '\nInvalid email address';
			var error = 1;
		}
	}

	if (error == 1) {
		alert('Error: '+alertmsg);
		return false;
	}
	else {
		displaySubmit('morePInfo');
	}
}

function checkSendPropertyForm() {
	var alertmsg = '';
	if (document.emailPropertyForm.senderName.value == '') {
		var alertmsg = 'Please complete your name.';
		var error = 1;
	}
	if (document.emailPropertyForm.rec.value == '') {
		var alertmsg = alertmsg + '\nPlease complete recipients email address';
		var error = 1;
	}
	if (document.emailPropertyForm.senderEmail.value == '') {
		var alertmsg = alertmsg + '\nPlease complete your email address';
		var error = 1;
	}
	if (document.emailPropertyForm.senderEmail.value != '')
	{
		if (echeck(document.emailPropertyForm.senderEmail.value)==false)
		{
			var alertmsg = alertmsg + '\nInvalid sender email address';
			var error = 1;
		}
	}
	if (document.emailPropertyForm.rec.value != '')
	{
		if (echeck(document.emailPropertyForm.rec.value)==false)
		{
			var alertmsg = alertmsg + '\nInvalid recipient email address';
			var error = 1;
		}
	}
	if (error == 1) {
		alert('Error: '+alertmsg);
		return false;
	}
	else {
		displaySubmit('emailProperty');
	}
}

function checkCF(rt)
{
	var error = 0;
	if (document.conform.name.value == '') {
		var error = 1;
	}
	if (document.conform.email.value == '') {
		var error = 1;
	}
	if (echeck(document.conform.email.value) == false) {
		alert('Invalid email address');
		var error = 1;
	}


	if (rt == 1) {

		if (document.conform.propertyRequestType.value == '0') {
			var error = 1;
		}
		if (document.conform.selectAreaIDFromContactForm.value == '0') {
			var error = 1;
		}
		if (document.conform.propertyRequestType.value == '0') {
			var error = 1;
		}
		if (document.conform.priceFrom.value == '') {
			var error = 1;
		}
		if (document.conform.priceTo.value == '') {
			var error = 1;
		}
		if (document.conform.sizeFrom.value == '') {
			var error = 1;
		}
		if (document.conform.sizeTo.value == '') {
			var error = 1;
		}
	}

	if (error == 1) {
		alert('Please complete the contact form with all the required fields');
		return false;
	}
	else {
		document.conform.submit()
	}
}

function requestPDF(pid)
{
	var exfile = 'pdf.php?property='+pid;
	location = 'https://www.kazbar.gr/'+exfile;
}