// validate email 
function emailCheck (emailStr)
{
	emailStr = emailStr.toLowerCase();
/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */

var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* The following pattern is used to check if the entered e-mail address
fits the user@domain format.  It also is used to separate the username
from the domain. */

var emailPat=/^(.+)@(.+)$/;

/* The following string represents the pattern for matching all special
characters.  We don't want to allow special characters in the address. 
These characters include ( ) < > @ , ; : \ " . [ ] */

var specialChars="\\(\\)><@,;:*/$\\\\\\\"\\.\\[\\]";

/* The following string represents the range of characters allowed in a 
username or domainname.  It really states which chars aren't allowed.*/

var validChars="\[^\\s" + specialChars + "\]";

/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */

var quotedUser="(\"[^\"]*\")";

/* The following pattern applies for domains that are IP addresses,
rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */

var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

/* The following string represents an atom (basically a series of non-special characters.) */

var atom=validChars + '+';

/* The following string represents one word in the typical username.
For example, in john.doe@somewhere.com, john and doe are words.
Basically, a word is either an atom or quoted string. */

var word="(" + atom + "|" + quotedUser + ")";

// The following pattern describes the structure of the user

var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */

var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

/* Finally, let's start trying to figure out if the supplied address is valid. */

/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */

var matchArray=emailStr.match(emailPat);

if (matchArray==null) {

/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */

alert("Invalid Email address");


indexForm.email.focus();
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

var firstChar = user.substr(0,1);
if (firstChar.charCodeAt(0)>47 && firstChar.charCodeAt(0)<58)
{
	alert("Invalid Email address");
	
	indexForm.email.focus();
	return false;
}

// Start by checking that only basic ASCII characters are in the strings (0-127).


for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

alert("Invalid Email address");

indexForm.email.focus();
return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {

// this is an IP address

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
   }
}
return true;
}

// Domain is symbolic name.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
alert("Invalid Email address");

indexForm.email.focus();
return false;
}

// If we've gotten this far, everything's valid!
return true;
}

function isPasswordOK(){
	
	var field_val=indexForm.password.value.replace(/[ ]/g, "");
	if (field_val.length==0){
		alert('Please type your Password');		
		indexForm.password.focus();
		return false;
		}
	return true;
}
function isNameOK()
{
	var field_val=indexForm.name.value.replace(/[ ]/g, "");	
	if (field_val.length==0)
		{
		alert('Please type your Name');		
		indexForm.name.focus();
		return false;
		}
	var firstChar = field_val.substr(0,1);
	if (firstChar.charCodeAt(0)>47 && firstChar.charCodeAt(0)<58)
	{
		alert("Name should start with alphabets only");		
		indexForm.name.focus();
		return false;
	}

	var charpos = indexForm.name.value.search("[^A-Za-z0-9\._]"); 
	if(indexForm.name.value.length > 0 &&  charpos >= 0) 
	{ 
	    alert("Name accepts only alpha-numeric characters "); 
		indexForm.name.focus();
		return false; 
	 }//if    

	return true;
}

function isTermsOk(){
	if (!indexForm.terms.checked){
		alert('Please select Terms and Conditions option');
		indexForm.checked.focus();
		return false;
		}
	return true;
}

function isBirthDateOK(){
	var field_val1=indexForm.dd.value;
	var field_val2=indexForm.mm.value;
	var field_val3=indexForm.yy.value;

	if(field_val1 == "DD"){
		alert('Please select your day of birth.');
		
		indexForm.dd.focus();
		return false;
	}
	if(field_val1 == ""){
		alert('Please select your day of birth.');
		
		indexForm.dd.focus();
		return false;
	}
	if(field_val2 == "MM"){
		alert('Please select your month of birth.');
		
		indexForm.mm.focus();
		return false;
	}
	if(field_val2 == ""){
		alert('Please select your month of birth.');
		
		indexForm.mm.focus();
		return false;
	}
	if(field_val3 == "YYYY"){
		alert('Please select your year of birth.');
		
		indexForm.yy.focus();
		return false;
	}
	if(field_val3 == ""){
		alert('Please select your year of birth.');
		
		indexForm.yy.focus();
		return false;
	}		
	if (field_val3.length<4){
		alert('Please select your year of birth.');
		
		indexForm.yy.focus();
		return false;
	}
	if(indexForm.yy.value < 1900 || indexForm.yy.value >= 2003)
	{
		alert("Year of Birth field is Invalid.\nPlease enter a proper value.");
		
		indexForm.yy.focus();
		return false;
	}
	if(!isInteger(field_val3))
	{
		alert("Year of Birth field accepts only numbers");		
		
		indexForm.yy.focus();
		return false;
		
	}
			
	var curdate=new Date();
	var intMonth=curdate.getMonth()+1;
	var intDay=curdate.getDate();
	var intYear=curdate.getFullYear();
	var intLeaf = (curdate.getFullYear()- field_val3)/4 		
	var one_year=1000*60*60*24*365
	var one_day = 1000*60*60*24*intLeaf ;
	var selectedDate = new Date(field_val3 , field_val2-1 ,field_val1);			
	var age = (curdate.getTime()-selectedDate.getTime()-one_day)/one_year;
	
	if(age >= 13)
	{		
		return true ;
	}  
	else
	{
		alert("You must be 13 years of age or older to participate");	
		
		indexForm.dd.focus();
		return false;
	}	
}

//check zipcode is ok
function isZipcodeOK(){	
	var field_val=indexForm.zip.value.replace(/[ ]/g, "");
	for (i=0; i<field_val.length; i++) {
		if (field_val.charCodeAt(i)<47 && field_val.charCodeAt(i)>58) {
			alert("Zip code accepts only numbers");
			return false;
   			}
		}
	if (field_val.length<5){
		alert('Please type your postal Zip Code.');
		
		indexForm.zip.focus();
		return false;
		}
	if(!isInteger(field_val))
	{
		alert("Zip code accepts only numbers");
		
		indexForm.zip.focus();
		return false;		
	}
	return true;
}

// chceck lastname is ok
function isLastnameOK(){ 	
	var field_val=indexForm.lname.value.replace(/[ ]/g, "");		
	if (field_val.length==0){
		alert('Please type your last name');
		indexForm.lname.focus();
		return false;
		}
	var firstChar = field_val.substr(0,1);
	if (firstChar.charCodeAt(0)>47 && firstChar.charCodeAt(0)<58)
	{
		alert("Last name should start with alphabets only");
		indexForm.lname.focus();
		return false;
	}

	var charpos = indexForm.lname.value.search("[^A-Za-z0-9\._]"); 
	if(indexForm.lname.value.length > 0 &&  charpos >= 0) 
	{ 
	    alert("Last name accepts only alpha-numeric characters "); 
		indexForm.lname.focus();
		return false; 
	 }//if 
	return true;
}



function clearYear()
{	
	var field_val3=indexForm.yy.value;
	if(field_val3 == "YYYY")
	{
		indexForm.yy.value='';
	}
	indexForm.yy.focus();
}

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 browserDetect()
{	
	
	 if(document.layers)
	 {
		thisbrowser="NN4";			
		indexForm = document.indexForm;
	 }
	 if(document.all)
	 {
		thisbrowser="ie";
	 }
	 if(!document.all && document.getElementById)
	 {
		thisbrowser="NN6";			
		indexForm = document.indexForm;
	 }			
}	

var isNN = (navigator.appName.indexOf("Netscape")!=-1);
	
	function autoTab(input,len, e)
	{
		var keyCode = (isNN) ? e.which : e.keyCode; 
		var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
		if(input.value.length >= len && !containsElement(filter,keyCode))
		{
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
		}		
		function containsElement(arr, ele)
	  	{
			var found = false, index = 0;
			while(!found && index < arr.length)
			if(arr[index] == ele)
			found = true;
			else
			index++;
			return found;
		}
		
		function getIndex(input)
		{
			var index = -1, i = 0, found = false;
			while (i < input.form.length && index == -1)
			if (input.form[i] == input)index = i;
			else i++;
			return index;
		}
		return true;
	}