function checkdate(dayval,monthval,yearval)	
{
var monarr=new Array();
dt=new Date();
var bFlag= true 
if((eval(yearval)%4)==0)
		{
	
		if(eval(monthval)==2)
			{

			if(eval(dayval)>29)
				{
			return false;
				}
				else
				return true;
			}
		}	
		else if((eval(yearval%4))!=0)	
		{
						
			if(eval(monthval)==2)
				{
				
					if(eval(dayval)>28)
						{

						return false;
						}
						else
						return true;
				}
		}			
			monarr[0]=4;	
			monarr[1]=6;
			monarr[2]=9;
			monarr[3]=11;	
						
			for(i=0;i<monarr.length;i++)
			{
								
				if(eval(monthval)==eval(monarr[i]))
				{
					
							if(eval(dayval)>30)
								{
											
			return false;	
										break;
								}
							else
								{
										return true;
								}
							
				}
				else
				{
					return true;					
					break;
				
				}
				
			}
			
												
							
}	
			
						
//email address check
function isEmail(passedVal) {
  invalidChars = " /:,;[]()'"
  if (passedVal != "") {                       // cannot be empty 
     
  for (i=0; i<invalidChars.length; i++) {  // any invalid chars?
     badChar = invalidChars.charAt(i)
     if (passedVal.indexOf(badChar, 0) > -1) {
        return false
     }
  }
  atPos = passedVal.indexOf("@", 1)            // at least one '@'
  if (atPos == -1) {
     return false
  }
  if (passedVal.indexOf("@", atPos+1) != -1) { // and only one '@'
     return false
  }
  periodPos = passedVal.indexOf(".", atPos)   // at least one '.' after '@'
  if (periodPos == -1) {
     return false
  }
  if (periodPos + 3  > passedVal.length) {    // at least 2 chars after '.'
     return false
  }
  }
}


/*  This function accepts three parameters CreditCard Type, CreditCard number and Expire date of card */
function CheckCreditCard(sCreditCardType,sCreditCardNumber,sExpireDateMonth,sExpireDateYear) {
	var Cards = new makeArray(8);
	Cards[0] = new CardType("MasterCard", "51,52,53,54,55", "16");
	var MasterCard = Cards[0];
	Cards[1] = new CardType("VisaCard", "4", "13,16");
	var VisaCard = Cards[1];
	Cards[2] = new CardType("AmExCard", "34,37", "15");
	var AmExCard = Cards[2];
	Cards[3] = new CardType("DinersClubCard", "30,36,38", "14");
	var DinersClubCard = Cards[3];
	Cards[4] = new CardType("DiscoverCard", "6011", "16");
	var DiscoverCard = Cards[4];
	Cards[5] = new CardType("enRouteCard", "2014,2149", "15");
	var enRouteCard = Cards[5];
	if (sCreditCardNumber.length == 0) { return "Please enter a Card Number.";	}
	if (sExpireDateYear.length == 0) { return "Please enter the Expiration Year.";	}
	var tmpyear;
	if (parseInt(sExpireDateYear) > 96) tmpyear = "19" + sExpireDateYear;
	else if (parseInt(sExpireDateYear) < 21) tmpyear = "20" + sExpireDateYear;
	else { 	return "The Expiration Year is not valid."; 	}
	tmpmonth = sExpireDateMonth;
	if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) {
		return "This card has already expired.";
	}
	card = sCreditCardType;
	var retval = eval(card + ".checkCardNumber(\"" + sCreditCardNumber + "\", " + tmpyear + ", " + tmpmonth + ");");
	cardname = "";
	if (!retval) {
		return "This card number is not valid.";
	}
	else {
		return true;
	}
}

/*************************************************************************\
Object CardType([String cardtype, String rules, String len, int year, 
                                        int month])
cardtype    : type of card, eg: MasterCard, Visa, etc.
rules       : rules of the cardnumber, eg: "4", "6011", "34,37".
len         : valid length of cardnumber, eg: "16,19", "13,16".
year        : year of expiry date.
month       : month of expiry date.
eg:
var VisaCard = new CardType("Visa", "4", "16");
var AmExCard = new CardType("AmEx", "34,37", "15");
\*************************************************************************/
function CardType() {
	var n;
	var argv = CardType.arguments;
	var argc = CardType.arguments.length;

	this.objname = "object CardType";

	var tmpcardtype = (argc > 0) ? argv[0] : "CardObject";
	var tmprules = (argc > 1) ? argv[1] : "0,1,2,3,4,5,6,7,8,9";
	var tmplen = (argc > 2) ? argv[2] : "13,14,15,16,19";

	this.setCardNumber = setCardNumber;  // set CardNumber method.
	this.setCardType = setCardType;  // setCardType method.
	this.setLen = setLen;  // setLen method.
	this.setRules = setRules;  // setRules method.
	this.setExpiryDate = setExpiryDate;  // setExpiryDate method.

	this.setCardType(tmpcardtype);
	this.setLen(tmplen);
	this.setRules(tmprules);
	if (argc > 4)	this.setExpiryDate(argv[3], argv[4]);

	this.checkCardNumber = checkCardNumber;  // checkCardNumber method.
	this.getExpiryDate = getExpiryDate;  // getExpiryDate method.
	this.getCardType = getCardType;  // getCardType method.
	this.isCardNumber = isCardNumber;  // isCardNumber method.
	this.isExpiryDate = isExpiryDate;  // isExpiryDate method.
	this.Check = Check;// luhnCheck method.
	return this;
}

/*************************************************************************\
boolean checkCardNumber([String cardnumber, int year, int month])
return true if cardnumber pass the luhncheck and the expiry date is
valid, else return false.
\*************************************************************************/
function checkCardNumber() {
	var argv = checkCardNumber.arguments;
	var argc = checkCardNumber.arguments.length;
	var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
	var year = (argc > 1) ? argv[1] : this.year;
	var month = (argc > 2) ? argv[2] : this.month;

	this.setCardNumber(cardnumber);
	this.setExpiryDate(year, month);

	if (!this.isCardNumber())
	return false;
	if (!this.isExpiryDate())
	return false;

	return true;
}
/*************************************************************************\
String getCardType()
return the cardtype.
\*************************************************************************/
function getCardType() {
	return this.cardtype;
}
/*************************************************************************\
String getExpiryDate()
return the expiry date.
\*************************************************************************/
function getExpiryDate() {
	return this.month + "/" + this.year;
}
/************************************************************************
boolean isCardNumber([String cardnumber])
return true if cardnumber pass the luhncheck and the rules, else return
false.
************************************************************************/
function isCardNumber() {
	var argv = isCardNumber.arguments;
	var argc = isCardNumber.arguments.length;
	var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
	if (!this.Check())	return false;

	for (var n = 0; n < this.len.size; n++)
		if (cardnumber.toString().length == this.len[n]) {
			for (var m = 0; m < this.rules.size; m++) {
				var headdigit = cardnumber.substring(0, this.rules[m].toString().length);
				if (headdigit == this.rules[m])
					return true;
			}
			return false;
	}
	return false;
}

/************************************************************************
boolean isExpiryDate([int year, int month])
return true if the date is a valid expiry date,
else return false.
************************************************************************/
function isExpiryDate() {
	var argv = isExpiryDate.arguments;
	var argc = isExpiryDate.arguments.length;

	year = argc > 0 ? argv[0] : this.year;
	month = argc > 1 ? argv[1] : this.month;

	if (!isNum(year+""))	return false;
	if (!isNum(month+""))	return false;
	today = new Date();
	expiry = new Date(year, month);
	if (today.getTime() > expiry.getTime())	return false;
	else	return true;
}

/*************************************************************************
boolean isNum(String argvalue)
return true if argvalue contains only numeric characters,
else return false.
*************************************************************************/
function isNum(argvalue) {
	argvalue = argvalue.toString();

	if (argvalue.length == 0)	return false;

	for (var n = 0; n < argvalue.length; n++)
		if (argvalue.substring(n, n+1) < "0" || argvalue.substring(n, n+1) > "9")
			return false;

	return true;
}

/*************************************************************************
boolean Check([String CardNumber])
return true if CardNumber pass the  check else return false.
*************************************************************************/
function Check() {
	var argv = Check.arguments;
	var argc = Check.arguments.length;
	var CardNumber = argc > 0 ? argv[0] : this.cardnumber;
	if (! isNum(CardNumber)) {	return false;  }
	var no_digit = CardNumber.length;
	var oddoeven = no_digit & 1;
	var sum = 0;
	for (var count = 0; count < no_digit; count++) {
		var digit = parseInt(CardNumber.charAt(count));
		if (!((count & 1) ^ oddoeven)) {
			digit *= 2;
			if (digit > 9)
				digit -= 9;
		}
		sum += digit;
	}
	if (sum % 10 == 0)	return true;
	else	return false;
}

/*************************************************************************\
ArrayObject makeArray(int size)
return the array object in the size specified.
\*************************************************************************/
function makeArray(size) {
	this.size = size;
	return this;
}

/*************************************************************************\
CardType setCardNumber(cardnumber)
return the CardType object.
\*************************************************************************/
function setCardNumber(cardnumber) {
	this.cardnumber = cardnumber;
	return this;
}

/*************************************************************************\
CardType setCardType(cardtype)
return the CardType object.
\*************************************************************************/
function setCardType(cardtype) {
	this.cardtype = cardtype;
	return this;
}

/*************************************************************************\
CardType setExpiryDate(year, month)
return the CardType object.
\*************************************************************************/
function setExpiryDate(year, month) {
	this.year = year;
	this.month = month;
	return this;
}

/*************************************************************************\
CardType setLen(len)
return the CardType object.
\*************************************************************************/
function setLen(len) {
// Create the len array.
	if (len.length == 0 || len == null)
	len = "13,14,15,16,19";

	var tmplen = len;
	n = 1;
	while (tmplen.indexOf(",") != -1) {
		tmplen = tmplen.substring(tmplen.indexOf(",") + 1, tmplen.length);
		n++;
	}
	this.len = new makeArray(n);
	n = 0;
	while (len.indexOf(",") != -1) {
		var tmpstr = len.substring(0, len.indexOf(","));
		this.len[n] = tmpstr;
		len = len.substring(len.indexOf(",") + 1, len.length);
		n++;
	}
	this.len[n] = len;
	return this;
}

/*************************************************************************\
CardType setRules()
return the CardType object.
\*************************************************************************/
function setRules(rules) {
// Create the rules array.
	if (rules.length == 0 || rules == null)
	rules = "0,1,2,3,4,5,6,7,8,9";
	  
	var tmprules = rules;
	n = 1;
	while (tmprules.indexOf(",") != -1) {
		tmprules = tmprules.substring(tmprules.indexOf(",") + 1, tmprules.length);
		n++;
	}
	this.rules = new makeArray(n);
	n = 0;
	while (rules.indexOf(",") != -1) {
		var tmpstr = rules.substring(0, rules.indexOf(","));
		this.rules[n] = tmpstr;
		rules = rules.substring(rules.indexOf(",") + 1, rules.length);
		n++;
	}
	this.rules[n] = rules;
	return this;
}