var ccErrorNo = 0;
var ccErrors = new Array ()

ccErrors [0] = "Unknown card type";
ccErrors [1] = "No card number provided";
ccErrors [2] = "Credit card number is in invalid format";
ccErrors [3] = "Credit card number is invalid";
ccErrors [4] = "Credit card number has an inappropriate number of digits";

function checkCreditCard (cardnumber, cardname) {
  // Array to hold the permitted card characteristics
  var cards = new Array();

  // Define the cards we support. You may add addtional card types.

  //  Name:      As in the selection box of the form - must be same as user's
  //  Length:    List of possible valid lengths of the card number for the card
  //  prefixes:  List of possible prefixes for the card
  //  checkdigit Boolean to say whether there is a check digit

  cards [0] = {name: "Visa",
               length: "13,16",
               prefixes: "4",
               checkdigit: true};
  cards [1] = {name: "MasterCard",
               length: "16",
               prefixes: "51,52,53,54,55",
               checkdigit: true};
  cards [2] = {name: "DinersClub",
               length: "14,16",
               prefixes: "300,301,302,303,304,305,36,38,55",
               checkdigit: true};
  cards [3] = {name: "CarteBlanche",
               length: "14",
               prefixes: "300,301,302,303,304,305,36,38",
               checkdigit: true};
  cards [4] = {name: "AmEx",
               length: "15",
               prefixes: "34,37",
               checkdigit: true};
  cards [5] = {name: "Discover",
               length: "16",
               prefixes: "6011,650",
               checkdigit: true};
  cards [6] = {name: "JCB",
               length: "15,16",
               prefixes: "3,1800,2131",
               checkdigit: true};
  cards [7] = {name: "enRoute",
               length: "15",
               prefixes: "2014,2149",
               checkdigit: true};
  cards [8] = {name: "Solo",
               length: "16,18,19",
               prefixes: "6334, 6767",
               checkdigit: true};
  cards [9] = {name: "Switch",
               length: "16,18,19",
               prefixes: "4903,4905,4911,4936,564182,633110,6333,6759",
               checkdigit: true};
  cards [10] = {name: "Maestro",
               length: "16",
               prefixes: "5020,6",
               checkdigit: true};
  cards [11] = {name: "VisaElectron",
               length: "16",
               prefixes: "417500,4917,4913",
               checkdigit: true};
  // Establish card type
  var cardType = -1;
  for (var i=0; i<cards.length; i++) {

    // See if it is this card (ignoring the case of the string)
    if (cardname.toLowerCase () == cards[i].name.toLowerCase()) {
      cardType = i;
      break;
    }
  }

  // If card type not found, report an error
  if (cardType == -1) {
     ccErrorNo = 0;
     return false;
  }

  // Ensure that the user has provided a credit card number
  if (cardnumber.length == 0)  {
     ccErrorNo = 1;
     return false;
  }

  // Now remove any spaces from the credit card number
  cardnumber = cardnumber.replace (/\s/g, "");

  // Check that the number is numeric
  var cardNo = cardnumber
  var cardexp = /^[0-9]{13,19}$/;
  if (!cardexp.exec(cardNo))  {
     ccErrorNo = 2;
     return false;
  }

  // Now check the modulus 10 check digit - if required
  if (cards[cardType].checkdigit) {
    var checksum = 0;                                  // running checksum total
    var mychar = "";                                   // next char to process
    var j = 1;                                         // takes value of 1 or 2

    // Process each digit one by one starting at the right
    var calc;
    for (i = cardNo.length - 1; i >= 0; i--) {

      // Extract the next digit and multiply by 1 or 2 on alternative digits.
      calc = Number(cardNo.charAt(i)) * j;

      // If the result is in two digits add 1 to the checksum total
      if (calc > 9) {
        checksum = checksum + 1;
        calc = calc - 10;
      }

      // Add the units element to the checksum total
      checksum = checksum + calc;

      // Switch the value of j
      if (j ==1) {j = 2} else {j = 1};
    }

    // All done - if checksum is divisible by 10, it is a valid modulus 10.
    // If not, report an error.
    if (checksum % 10 != 0)  {
     ccErrorNo = 3;
     return false;
    }
  }

  // The following are the card-specific checks we undertake.
  var LengthValid = false;
  var PrefixValid = false;
  var undefined;

  // We use these for holding the valid lengths and prefixes of a card type
  var prefix = new Array ();
  var lengths = new Array ();

  // Load an array with the valid prefixes for this card
  prefix = cards[cardType].prefixes.split(",");

  // Now see if any of them match what we have in the card number
  for (i=0; i<prefix.length; i++) {
    var exp = new RegExp ("^" + prefix[i]);
    if (exp.test (cardNo)) PrefixValid = true;
  }

  // If it isn't a valid prefix there's no point at looking at the length
  if (!PrefixValid) {
     ccErrorNo = 3;
     return false;
  }

  // See if the length is valid for this card
  lengths = cards[cardType].length.split(",");
  for (j=0; j<lengths.length; j++) {
    if (cardNo.length == lengths[j]) LengthValid = true;
  }

  // See if all is OK by seeing if the length was valid. We only check the
  // length if all else was hunky dory.
  if (!LengthValid) {
     ccErrorNo = 4;
     return false;
  };

  // The credit card is in the required format.
  return true;
}

/*============================================================================*/




function trim(string){
    return string.replace(/^\s*|\s*$/g,"");
}
function v_string(string)
{
    string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[A-Za-z ]+$/))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}
function v_name(string)
{
     string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[A-Za-z][A-Za-z0-9]+$/))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

function comparePassword (password ,password1)
{
    if(password != password1)
    {
        return false;
    }
    else
    {
        return true;
    }

}
function v_url(string)
{
  string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[a-z0-9][a-z0-9\-]+([\.][a-z0-9\-]+)*[\.][a-z]{2,4}(\/|\/([\w#!:.?+=&%@!\-\/]+))*$/i))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

}

function v_stalphaNum(string)
{
    string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[A-Za-z][A-Za-z0-9 -:]+$/))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}
function v_number(string)
{
    string = trim(string);
    if(parseInt(string) > 0)
    {
        if(string.match(/^[0-9]+$/))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    else
    {
        return false;
    }
}
function v_numberX(string)
{
    string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[0-9]+$/))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}
function v_email(string){
    string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
            if(string.match(/^[a-z0-9]{1}([\w\d\.])+@([a-z0-9\-\.])+([a-z]{2,4})$/i))
                {
                    if(string.match(/[\.]{2,}/))
                      {
                        return false;
                      }
                    else
                      {
                         return true;
                      }
                }
             else
                {
                    return false;
                }
    }
}
function v_fax(string){
	string = trim(string);
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/^[\+]?[\d]+[\d\s\-]+[\d]+$/))
         {
            return true;
         }
        else
         {
            return false;
         }
    }
}
function is_doc(string)
{
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/.(doc)$/i))
         {
            return true;
         }
        else
         {
            return false;
         }
    }
}

function is_logo(string)
{
    if(string == '')
    {
        return false;
    }
    else
    {
        if(string.match(/.(gif|jpg)$/i))
         {
            return true;
         }
        else
         {
            return false;
         }
    }
}

function is_empty(string){
	string = trim(string);
   if(string == ''){
        return false;
    }else{
        return true;
    }
}