// To open a popup window
function MM_openBrWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}

// Newsletter Subscription Form
function Newsletter() {
  	mailid = document.newsMail.email
	if (mailid.value == '')
	{
		alert("Please enter E-mail Id");
		mailid.focus()
		return false
	}
	else if (mailid.value.indexOf("@")==-1 || mailid.value.indexOf(".")==-1){
		alert("Invalid E-mail ID")
		mailid.focus()	   
		return false
	}
}

// Feedback form validation
function Feedback() {

	firstName = document.fbForm.txtFirstname
	if (firstName.value == "" || !isNaN(firstName.value))
	{
		alert("Please enter your first name");
		firstName.focus()
		return false		
	}

	lastName = document.fbForm.txtlastname
	if (lastName.value == "" || !isNaN(lastName.value))
	{
		alert("Please enter your last name");
		lastName.focus()
		return false		
	}

	dayPhone = document.fbForm.txtworkphone
	if (isNaN(dayPhone.value))
	{
		alert("Phone number you have entered is invalid");
		dayPhone.focus()
		return false		
	}

	eveningPhone = document.fbForm.txthomephone
	if (isNaN(eveningPhone.value))
	{
		alert("Phone number you have entered is invalid");
		eveningPhone.focus()
		return false		
	}

	mailid = document.fbForm.txtemail
	if (mailid.value == '')
	{
		alert("Please enter E-mail Id");
		mailid.focus()
		return false
	}
	else if (mailid.value.indexOf("@")==-1 || mailid.value.indexOf(".")==-1){
		alert("Invalid E-mail ID")
		mailid.focus()	   
		return false
	}

	age = document.fbForm.cmbAgeRange
	if (age.options(age.selectedIndex).value == "")
	{
		alert("Please select your age group");
		age.focus()
		return false		
	}	

	sportsAct = document.fbForm.txtsports
	if (sportsAct.value != "" && !isNaN(sportsAct.value))
	{
		alert("Please enter Sports Activities");
		sportsAct.focus()
		return false		
	}

	comments = document.fbForm.txtComments
	if (comments.value == "" || !isNaN(comments.value))
	{
		alert("Please add your comments");
		comments.focus()
		return false		
	}	
}

// Appointments form validation
function Appointment()
{
if (document.frmAppointment.txtFirstName.value=="" || !isNaN(document.frmAppointment.txtFirstName.value))
	{
	alert('Enter FirstName');
	document.frmAppointment.txtFirstName.focus();
	return false;
	}
if (document.frmAppointment.txtSurname.value=="" || !isNaN(document.frmAppointment.txtSurname.value))
	{
	alert('Enter Surname');
	document.frmAppointment.txtSurname.focus();
	return false;
	}
if (document.frmAppointment.txtHomePhoneNumber.value=="" || isNaN(document.frmAppointment.txtHomePhoneNumber.value))
	{
	alert('Enter Home Phone No.');
	document.frmAppointment.txtHomePhoneNumber.focus();
	return false;
	}
if (document.frmAppointment.txtBusinessPhoneNumber.value=="" || isNaN(document.frmAppointment.txtBusinessPhoneNumber.value))
	{
	alert('Enter Business Phone Number');
	document.frmAppointment.txtBusinessPhoneNumber.focus();
	return false;
	}
	
if (document.frmAppointment.txtMobileNumber.value!="" && isNaN(document.frmAppointment.txtMobileNumber.value))
	{
	alert('Mobile number you have entered is invalid');
	document.frmAppointment.txtMobileNumber.focus();
	return false;
	}
	
if (document.frmAppointment.txtEmailAddress.value=="")
	{
	alert('Enter Email Address');
	document.frmAppointment.txtEmailAddress.focus();
	return false;
	}
	else if (document.frmAppointment.txtEmailAddress.value.indexOf("@")==-1 || document.frmAppointment.txtEmailAddress.value.indexOf(".")==-1){
		alert("Invalid E-mail ID")
		document.frmAppointment.txtEmailAddress.focus()	   
		return false
	}	
}

// BMI Calculator

function mod(div,base) 
{
	return Math.round(div - (Math.floor(div/base)*base));
}

function calcBmi() 
{
var w = document.bmi.weight.value * 1;
var HeightFeetInt = document.bmi.htf.value * 1;
var HeightInchesInt = document.bmi.hti.value * 1;
HeightFeetConvert = HeightFeetInt * 12;
h = HeightFeetConvert + HeightInchesInt;
displaybmi = (Math.round((w * 703) / (h * h)));
var rvalue = true;
	if ( (w <= 35) || (w >= 999)  || (h <= 48) || (h >= 120) ) 
	{
		alert ("Invalid data.  Please check and re-enter!");
		rvalue = false;
	}
	
	if (rvalue) 
	{
		if (HeightInchesInt > 11) 
		{
			reminderinches = mod(HeightInchesInt,12);
			document.bmi.hti.value = reminderinches;
			document.bmi.htf.value = HeightFeetInt + 
			((HeightInchesInt - reminderinches)/12);
			document.bmi.answer.value = displaybmi;
		}
		document.bmi.answer.value = displaybmi; 
	}
		return rvalue;
}