// Function queIsEmailValid is based on emailCheck version 1.1.4
// from http://javascript.internet.com by Sandeep V. Tamhankar (stamhankar@hotmail.com)
// Origin URL: http://javascript.internet.com/forms/email-address-validation.html
function queIsEmailValid(value)
{

  var checkKnownDomain = 1;

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

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

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

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

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

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

  var atom = validChars + '+';

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

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

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

  var matchArray = value.match(emailExp);

  if (matchArray == null)
  {
    //alert("Email address seems incorrect (check @ and .'s)");
    return false;
  }

  var user = matchArray[1];
  var domain = matchArray[2];

  var i = 0;
  for (i = 0; i < user.length; ++i)
  {
    if (user.charCodeAt(i) > 127)
    {
      // alert("Ths username contains invalid characters.");
      return false;
    }
  }
  for (i = 0; i < domain.length; ++i)
  {
    if (domain.charCodeAt(i) > 127)
    {
      // alert("Ths domain name contains invalid characters.");
      return false;
    }
  }

  if (user.match(userExp) == null)
  {
    // alert("The username doesn't seem to be valid.");
    return false;
  }

  var ipArray = domain.match(ipDomainExp);
  if (ipArray != null)
  {
    for (var i = 1; i <= 4; ++i)
    {
      if (ipArray[i] > 255)
      {
        // alert("Destination IP address is invalid!");
        return false;
      }
    }
    return true;
  }

  // Domain is symbolic name.  Check if it's valid.
 
  var atomExp=new RegExp("^" + atom + "$");
  var domainArray = domain.split(".");
  var len = domainArray.length;
  for (i = 0; i < len; ++i)
  {
    if (domainArray[i].search(atomExp) == -1)
    {
      // alert("The domain name does not seem to be valid.");
      return false;
    }
  }

  var topLevelDomain = domainArray[domainArray.length-1];
  if (checkKnownDomain && topLevelDomain.length != 2 &&
    topLevelDomain.search(knownDomainsExp) == -1)
  {
    // alert("The address must end in a well-known domain or two letter " + "country.");
    return false;
  }

  if (len < 2)
  {
    // alert("This address is missing a hostname!");
    return false;
  }

  return true;
}

function queIsSpecialSymbol(character)
{
  return (character <= '~' && !(character >= 'a' && character <= 'z') &&
     !(character >= 'A' && character <= 'Z') &&
     !(character >= '0' && character <= '9'));
}

function queIsDigit(character)
{
  return (character >= '0' && character <= '9');
}

function queIsPhoneNumberValid(value)
{
  var digitsCount = 0;
  for (var i = 0; i < value.length; ++i)
  {
    var character = value.charAt(i);
    if (queIsSpecialSymbol(character)) continue;

    if (!queIsDigit(character))
    {
      return false;
    }

    ++digitsCount;
  }
  return (digitsCount >= 4);
}

function queValidateControl(name, messageForEmpty, messageForInvalid)
{
  var element = document.getElementsByName(name)[0];
  if (element)
  {
    if ((element.tagName == "INPUT" && element.value == "") ||
      (element.tagName == "SELECT" && element.selectedIndex == 0))
    {
      alert(messageForEmpty);
      element.focus();
      return false;
    }
    else if (name == 'email' && !queIsEmailValid(element.value))
    {
      alert(messageForInvalid);
      element.focus();
      return false;
    }
    else if (name == 'phone_number' && !queIsPhoneNumberValid(element.value))
    {
      alert(messageForInvalid);
      element.focus();
      return false;
    }
  }
  return true;
}

function queValidateControls(parameters)
{
  for (var i = 0; i < parameters.length; ++i)
  {
    var result = queValidateControl(parameters[i][0], parameters[i][1],
      parameters[i][2]);
    if (!result) return false;
  }
  return true;
}

function queSetAction(value)
{
  var element = document.getElementsByName('action')[0];
  if (element)
  {
    element.value = value;
    return true;
  }
  else
  {
    return false;
  }
}