function adjustCCVNumber()
{
	if(document.place_order.CardType.value == "AmericanExpress")
	{
		//make them 4
		document.place_order.CVN.size = 4;
		document.place_order.CVN.maxLength = 4;
	}
	else
	{
		//make them 3
		document.place_order.CVN.size = 3;
		document.place_order.CVN.maxLength = 3;
	}
}

function validateBillingAddress(){
	
	if (document.place_order.billing_same.checked) {
		
		document.place_order.BAddress1.value = document.place_order.SAddress1.value;
		document.place_order.BAddress1.disabled = true;
		
		document.place_order.BAddress2.value = document.place_order.SAddress2.value;
		document.place_order.BAddress2.disabled = true;
		
		document.place_order.BCity.value = document.place_order.SCity.value;
		document.place_order.BCity.disabled = true;
		
		document.place_order.BState.value = document.place_order.SState.value;
		document.place_order.BState.disabled = true;
		
		document.place_order.BCountry.value = document.place_order.SCountry.value;
		document.place_order.BCountry.disabled = true;
		
		document.place_order.BZipCode.value = document.place_order.SZipCode.value;
		document.place_order.BZipCode.disabled = true;
	
	} else {
		
		document.place_order.BAddress1.value = "";
		document.place_order.BAddress1.disabled = false;
		
		document.place_order.BAddress2.value = "";
		document.place_order.BAddress2.disabled = false;
		
		document.place_order.BCity.value = "";
		document.place_order.BCity.disabled = false;
		
		document.place_order.BState.value = "";
		document.place_order.BState.disabled = false;
		
		document.place_order.BCountry.value = "";
		document.place_order.BCountry.disabled = false;
		
		document.place_order.BZipCode.value = "";
		document.place_order.BZipCode.disabled = false;
		
	}
	
}

function enablebSubmit(){
if(document.place_order.accept.checked)
   document.place_order.trimite.disabled=false;
 else 
  document.place_order.trimite.disabled=true;
}

function checknumber(number){
if(isNaN(number))
return false;
else
return true;
}


function its_a_letter(character) {

   var lowercase_letters = "abcdefghijklmnopqrstuvwxyz"
   var uppercase_letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

   // If it's not in the lowercase_letters string or the
   // uppercase_letters string, then it's not a letter,
   // so return false
   
   if (lowercase_letters.indexOf(character) == -1 &&
       uppercase_letters.indexOf(character) == -1) {
       return false
   }
   
   // Otherwise, it's a letter, so return true
   return true
}

function is_email(email) {
 if((email.search("@")==-1)||(email.search("[.*]")==-1))
		  {
		    alert("Please provide a valid Email Address.");
			eval('document.place_order.ContactEmail.focus()');
			return false;
		  }
	return true	  
}

 reZip = new RegExp(/(^\d{5}$)|(^\d{5}-\d{4}$)/);
 
 function validateForm(){
    var meg="Please verify the follow field(s):\n";

	//Personal Info
    if( document.place_order.FirstName.value == "" )
	    meg +="First Name\n";
    if( document.place_order.LastName.value == "" )
	    meg +="Last Name\n";
    if( document.place_order.EmailAddress.value == "" )
	    meg +="Email Address\n";
    if( document.place_order.ConfirmEmailAddress.value == "" )
	    meg +="Confirm Email Address\n";	    
    if( document.place_order.SAddress1.value == "" )
	    meg +="Shipping Address\n";
	if( document.place_order.SCity.value == "" )
	    meg +="Shipping City\n";
	if (document.place_order.SZipCode.value == "")
        meg +="Shipping Zip Code\n";
   
	if( document.place_order.BAddress1.value == "" )
	    meg +="Billing Address\n";
	if( document.place_order.BCity.value == "" )
	    meg +="Billing City\n";
	if (document.place_order.BZipCode.value == "")
        meg +="Billing Zip Code\n";	
	if( document.place_order.Phone1.value == "" || document.place_order.Phone2.value == ""||document.place_order.Phone3.value == "" )
	    meg +="Telephone\n";

	//check creadt card<br /> 
	if(document.place_order.CCFName.value=="" || document.place_order.CCLName.value=="" )
		meg +="Card Holder's Name\n";
	
	if(document.place_order.ExpMonth.selectedIndex==0 || document.place_order.ExpYear.selectedIndex==0  )
		meg +="Expiration Date\n";
	
	myCardNo = document.getElementById('CardNumber').value;
	myCardType = document.getElementById('CardType').value;
	
	//alert(myCardNo + myCardType);
	
	if(!checkCreditCard (myCardNo,myCardType))
	{
		//alert(ccErrorNo);
		if(ccErrorNo != -1)
		{
			meg += ccErrors[ccErrorNo];
		}
	}
	
	if(!document.place_order.accept.checked)
	{
		meg +="Please accept the Terms and Conditions\n";
	}
	
   	if (meg!="Please verify the follow field(s):\n")
	{  
		alert (meg);
		return false;
	} else {		
		return true;
	}			   
}

var ccErrorNo = -1;
var ccErrors = new Array ()

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

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: "AmericanExpress", 
               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", 
               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;
}

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