function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;
	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

function isValidExpDate(iMonth,iYear)
{
	var result		= true;
	
	var formValue	= iMonth + '/' + iYear;
  
 	if (result)
 	{
 		var elems	= formValue.split("/");
 		
 		result		= (elems.length == 2); // should be two components
 		var expired = false;
 		
 		if (result)
 		{
 			var month = parseFloat(elems[0]);
 			var year = parseFloat(elems[1]);
 			
 			if (elems[1].length == 2)
 				year += 2000;
 			
 			var now			= new Date();
 			
 			var nowMonth	= now.getMonth() + 1;
 			var nowYear		= now.getFullYear();
 			
 			expired = (nowYear > year) || ((nowYear == year ) && (nowMonth > month));
 			
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && ((elems[1].length == 2) || (elems[1].length == 4));
 		}
 		
  		if (expired) {
 			result = false;
		}
	} 
	
	return result;
}

function isValidCreditCardNumber(ccNumber,ccType)
{
	var result	= true;
 
  	if (result)
 	{ 
 		if (!allDigits(ccNumber))
 		{
			result = false;
		}	

		if (result)
 		{ 
 			if (!LuhnCheck(ccNumber) || !validateCCNum(ccType,ccNumber))
 			{
				result = false;
			}	
		} 
	} 
	return result;
}

function LuhnCheck(str) {
  var result = true;

  var sum = 0; 
  var mul = 1; 
  var strLen = str.length;
  
  for (i = 0; i < strLen; i++) {
    var digit = str.substring(strLen-i-1,strLen-i);
    var tproduct = parseInt(digit ,10)*mul;
    if (tproduct >= 10)
      sum += (tproduct % 10) + 1;
    else
      sum += tproduct;
    if (mul == 1)
      mul++;
    else
      mul--;
  }
  if ((sum % 10) != 0) {
	result = false;
  }
    
  return result;
}

function GetRadioValue(rArray)
{
	for (var i=0;i<rArray.length;i++)
	{
		if (rArray[i].checked)
			return rArray[i].value;
	}
	
	return null;
}

function validateCCNum(cardType,cardNum)
{
	var result		= false;
	cardType		= cardType.toUpperCase();
	
	var cardLen		= cardNum.length;
	var firstdig	= cardNum.substring(0,1);
	var seconddig	= cardNum.substring(1,2);
	var first4digs	= cardNum.substring(0,4);

	switch (cardType)
	{
		case "VISA":
			result = ((cardLen == 16) || (cardLen == 13)) && (firstdig == "4");
			break;
		case "AMEX":
			var validNums = "47";
			result = (cardLen == 15) && (firstdig == "3") && (validNums.indexOf(seconddig)>=0);
			break;
		case "MC":
			var validNums = "12345";
			result = (cardLen == 16) && (firstdig == "5") && (validNums.indexOf(seconddig)>=0);
			break;
		case "DISC":
			result = (cardLen == 16) && (first4digs == "6011");
			break;
	}
	return result;
}

function validCCForm(ccTypeField,ccNumField,ccExpField)
{
	var result = isValidCreditCardNumber(ccNumField,ccTypeField.value,"Credit Card Number",true) &&
		isValidExpDate(ccExpField,"Expiration Date",true);
	return result;
}

function openCCSec() {
	var newWin;
	newWin = window.open('/help/cc.asp','SecurityCode','height=420,width=520,toolbar=no,menubar=no,scrollbar=auto,top=50,left=50');
}

// based on script by Sandeep V. Tamhankar (stamhankar@hotmail.com) 
function verifyEmail(emailStr) {
	var emailPat = /^(.+)@(.+)$/;
	var specialChars = "\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars = "\[^\\s" + specialChars + "\]";
	var quotedUser = "(\"[^\"]*\")";
	var ipDomainPat = /^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom = validChars + '+';
	var word = "(" + atom + "|" + quotedUser + ")";
	var userPat = new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat= new RegExp("^" + atom + "(\\." + atom +")*$");

	var matchArray = emailStr.match(emailPat);

	if (matchArray == null) { return false;}

	var user = matchArray[1]
	var domain = matchArray[2]
	if (user.match(userPat) == null) { return false; }

	var IPArray=domain.match(ipDomainPat)
	if (IPArray != null) {
		for (var i=1; i<=4; i++) {
	    		if (IPArray[i] > 255) {
	        		return false;
	    		}
    	}
   		return true;
	}

	var domainArray = domain.match(domainPat)
	if (domainArray == null) {
		return false;
	}

	var atomPat = new RegExp(atom,"g")
	var domArr = domain.match(atomPat)
	var len = domArr.length
	if (domArr[domArr.length-1].length < 2 || domArr[domArr.length-1].length > 3) {
		return false;
	}

	if (len < 2) { return false; }
	
   	return true;
}