// JavaScript Document

/**
 * DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

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 address")
	   return false
	}

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

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

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

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

	if (str.indexOf(dot,(lat+2))==-1){
	    alert("Invalid E-mail address")
	    return false
	}
	
	if (str.indexOf(" ")!=-1){
	    alert("Invalid E-mail address")
	    return false
	}
	return true					
}
function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone)
{
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}
	
function Validateform(){
    var firstname = document.frmRegister.txtFirstname;
	var surname = document.frmRegister.txtSurname;
    var email = document.frmRegister.txtEmail;
    var zip = document.frmRegister.txtZip;
    var phoneno = document.frmRegister.txtPhone;
	var mobileno = document.frmRegister.txtMobile;
    var user = document.frmRegister.txtUsername;
    var password = document.frmRegister.txtPwd;
	var year = document.frmRegister.txtYear;
	var month = document.frmRegister.txtMonth;
	var day = document.frmRegister.txtDay;
	var captcha = document.frmRegister.strCAPTCHA;

	if ((firstname.value==null)||(firstname.value==""))
	{
		alert("Please enter your first name");
		firstname.focus();
		return (false);
	}
	else if ((surname.value==null)||(surname.value==""))
	{
		alert("Please enter your surname");
		surname.focus();
		return (false);
	}
	else if ((phoneno.value==null)||(phoneno.value=="")){
		alert("Please Enter your Phone Number")
		phoneno.focus();
		return (false);
	}
	else if (checkInternationalPhone(phoneno.value)==false){
		alert("Please Enter a Valid Phone Number")
		phoneno.value="";
		phoneno.focus();
		return (false);
	}
	else if ((mobileno.value == null)|| (mobileno.value==""))
	{
		alert("Please Enter your Mobile Phone Number");
		mobileno.focus();
		return (false);
	}
	else if (checkInternationalPhone(mobileno.value) == false)
	{
		alert("Please Enter a Valid Mobile Phone Number")
		mobileno.value="";
		mobileno.focus();
		return (false);
	}
	else if (month.selectedIndex == 0 || day.selectedIndex == 0 || year == "" || year == null)
	{
		alert("Please enter Date of Birth!");
		return (false);
	}
	else if (isNaN(year.value))
	{
    	alert("Invalid data format. Only numbers are allowed."); 
        year.value="";
        year.focus();
        return (false);
	}
	else if ((email.value==null)||(email.value==""))
	{
		alert("Please Enter your Email address");
		email.focus();
		return (false);
	}
	else if (echeck(email.value)==false)
	{
		email.value="";
		email.focus();
		return (false);
	}
	else if (email.value != document.frmRegister.txtEmailAgain.value)
	{
	    alert("Email and Confimed Email not match. Plese re-enter");
	    email.focus();
	    return (false);
	}

	else if ((user.value==null)||(user.value=="")){
		alert("Please enter user name");
		user.focus();
		return (false);
	}
	else if ((password.value==null) || (password.value==""))
	{
		alert("Please enter password");
		password.focus();
		return (false);
	}
	else if (password.value != document.frmRegister.txtPwdAgain.value)
	{
	    alert("Password and Password Again not match. Please re-enter.");
	    password.focus();
	    return (false);
	}
	else if (captcha.value == null || captcha.value == ""){
	    alert("Please enter image verification");
	    captcha.focus();
	    return (false);
	}
	return (true);
}