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 checkRadioButton(cardName)
{

 var rdolist = document.getElementsByName("ctl00$WebsiteContent$rblCardType");
     for(i=0; i < rdolist.length; i++ )
     {
      if (rdolist[i].value == cardName)
      {
        rdolist[i].checked = true;
      }
    }
}

function checkSelectedCard(){

 var cardname = '';
 var rdolist = document.getElementsByName("ctl00$WebsiteContent$rblCardType");
 var issueNumber = document.getElementById("issueNumber");
 
     for(i=0; i < rdolist.length; i++ ){
      if (rdolist[i].checked)
      {
        cardname = rdolist[i].value;
      }
    }
   
    if(cardname == 'Maestro' || cardname == 'Solo' )
    { 
        issueNumber.style.visibility = "visible";
        issueNumber.style.display = "block";
    }
    else
    {
        issueNumber.style.display = "none";
        issueNumber.style.visibility = "hidden";
    }
}

function  checkIssueStartDate(oSrc, args){
 args.IsValid = true; 
 var cardname = '';
 var rdolist = document.getElementsByName("ctl00$WebsiteContent$rblCardType");
 var issueNumber = document.getElementById("ctl00_WebsiteContent_txtIssueNumber");
 var startDateMonth = document.getElementById("ctl00_WebsiteContent_ddlStartMonth");
 var startDateYear = document.getElementById("ctl00_WebsiteContent_ddlStartYear");

     for(i=0; i < rdolist.length; i++ ){
      if (rdolist[i].checked)
      {
        cardname = rdolist[i].value;
      }
    }
   
    if(cardname == 'Maestro' || cardname == 'Solo' )
    { 
        
        if(issueNumber.value == '' && (startDateMonth.value == '' || startDateYear.value =='')){
            args.IsValid = false;
        }
    }
}
function checkCardType(oSrc, args){
 args.IsValid = true; 
 var cardname = '';
 var rdolist = document.getElementsByName("ctl00$WebsiteContent$rblCardType");

     for(i=0; i < rdolist.length; i++ ){
      if (rdolist[i].checked)
      {
        cardname = rdolist[i].value;
      }
    }
    if(cardname == ''){
     args.IsValid = false; 
    }
}

function checkCreditCard(oSrc, args)
{
  args.IsValid = true; 
 var cardname = '';
 var rdolist = document.getElementsByName("ctl00$WebsiteContent$rblCardType");

     for(i=0; i < rdolist.length; i++ ){
      if (rdolist[i].checked)
      {
        cardname = rdolist[i].value;
      }
    }

  if(cardname != ''){
      var cardnumber = document.getElementById("ctl00_WebsiteContent_txtCardNumber").value;
      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: "16,18,19", 
                   prefixes: "5020,6,4903,4905,4911,4936,564182,633110,6333,6759",
                   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;
           args.IsValid = false; 
      }
       
      // Ensure that the user has provided a credit card number
      if (cardnumber.length == 0)  {
         ccErrorNo = 1;
           args.IsValid = 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;
           args.IsValid = 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;
           args.IsValid = 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;
           args.IsValid = 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;
           args.IsValid = false; 
      }   
      
      // The credit card is in the required format.
  }
  else{
   
   oSrc.ErrorMessage = "Please select a card type";
   args.IsValid = false; 
  }
}