function emailCheck (emailStr) {

/* 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("Адрес e-mail написан неправильно (проверьте @ и .'s)");
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// 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("Имя пользователя содержит неправильные знаки.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Название домена содержит неправильные знаки.");
return false;
   }
}

// See if "user" is valid 

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

// user is not valid

alert("Имя пользователя написано неправильно.");
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("Конечный адрес IP направильный!");
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("Имя домена неправильное!");
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("Адрес должен оканчиваться на известное окончание домена или на две буквы " + "страны.");
return false;
}

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

if (len<2) {
alert("В адресе не хватает host name!");
return false;
}

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

//  End -->

function validRequired(formField,fieldLabel)
{
  var result = true;
  
  if (formField.value == "")
  {
    alert('Поле "' + fieldLabel +'" не может быть пустым!');
    formField.focus();
    result = false;
  }
  
  return result;
}


function Length_TextField_Validator(formField)
{
// Check the length of the value of the element named text_name
// from the form named form_name if it's < 3 and > 10 characters
// display a message asking for different input
if ((formField.value.length < 6) || (formField.value.length > 12))
{
// Build alert box message showing how many characters entered
mesg = "Вы написали " + formField.value.length + " знака(ов).\n"
mesg = mesg + "Пароль должен иметь от 6 до 12 знаков.\n"
mesg = mesg + "Пожалуйста проверьте Ваш пароль и введите его ещё раз."
alert(mesg);
// Place the cursor on the field for revision
formField.focus();
// return false to stop further processing
return (false);
}
// If text_name is not null continue processing
return (true);
}

function Length_TextField_Validator2(formField)
{
// Check the length of the value of the element named text_name
// from the form named form_name if it's < 3 and > 10 characters
// display a message asking for different input
if ((formField.value.length != 36))
{
// Build alert box message showing how many characters entered
mesg = "Вы написали " + formField.value.length + " знака(ов).\n"
mesg = mesg + "PIN код должен иметь 36 знаков, включая '-'.\n"
mesg = mesg + "Пожалуйста проверьте Ваш PIN код и введите его ещё раз."
alert(mesg);
// Place the cursor on the field for revision
formField.focus();
// return false to stop further processing
return (false);
}
// If text_name is not null continue processing
return (true);
}

function latinCheck(s)
{
 if(s.value.length && s.value.charCodeAt(s.value.length-1) > 196)
 {
  s.value=s.value.substring(0,s.value.length-1);
  alert('Пожалуйста печатайте латинскими буквами!');
 }
}

function russianCheck(s)
{
 if(s.value.length && s.value.charCodeAt(s.value.length-1) < 196)
 {
  s.value=s.value.substring(0,s.value.length-1);
  alert('Пожалуйста печатайте русскими буквами!');
 }
}

function validateForm(Form1)
{
  // Customize these calls for your form

  // Start ------->
 
  if (!emailCheck(document.forms[0].txtLogin.value))
    return false;

    // <--------- End
    
   if (!Length_TextField_Validator(document.forms[0].txtPassword))
			return false;
			
			
		if (!Length_TextField_Validator(document.forms[0].txtRepeatPassword))
			return false;
			
			return true;
}

function validatePIN(Form1)
{
  // Customize these calls for your form

  // Start ------->
  if (!validRequired(document.forms[0].txtPIN,"PIN"))
    return false;


    // <--------- End
    
   if (!Length_TextField_Validator2(document.forms[0].txtPIN))
			return false;
			
			return true;
}

function validateForget(Form1)
{
  // Customize these calls for your form

  // Start ------->
  if (!validRequired(document.forms[0].txtForgetPassword,"Логин"))
    return false;


  if (!emailCheck(document.forms[0].txtForgetPassword.value))
    return false;

    
			return true;
			
 // <--------- End
}