var CheckArray = new Array(); //fields to check are not blank

var pcCheckArray = new Array(); //postcode fields to check

var emailCheckArray = new Array(); //email fields to check

var numericCheckArray = new Array(); //fields that have to be numeric

var dateCheckArray = new Array(); //date fields to check, e.g. new Array("dobday","dobmonth","dobyear","Date of birth")

var issueArray = new Array();//for switch issue number - only ONE allowed on page

var ccCheckArray = new Array();//for credit card number field

var monthCheck = new Array();//for month check e.g.monthCheck["expiry_month"] = new Array("expiry_year","Expiry month");//need corresponding year field

function CC_Validate(ccNum,ccType)//credit card number,credit card type, e.g. new Array("card_type","Card number");

{

	var checksum = 0;

	var i;

	var digit;

	var temp;

	var cclength=ccNum.length;

	var ccFirstOne = ccNum.substr(0,1);

	var ccFirstTwo = ccNum.substr(0,2);



	ccType = ccType.toUpperCase();



	if (ccType == "VISA")

	{

		if (!(cclength == 13 || cclength == 16))

			return false;

		if (!(ccFirstOne == "4"))

			return false;

	}

	else if (ccType == "MASTERCARD")

	{

		if (!(cclength == 16))

			return false;

		if (!(ccFirstTwo == "51" || ccFirstTwo == "52" || ccFirstTwo == "53" || ccFirstTwo == "54" || ccFirstTwo == "55") )

			return false;

	}

	else if (ccType == "AMEX")

	{

		if (!(cclength == 15))

			return false;

		if (!(ccFirstTwo == "34" || ccFirstTwo == "37") )

			return false;

	}

	else if (ccType == "SWITCH" || ccType == "DELTA" || ccType == "SOLO")

	{

		//no check on length - valid length not known at present

	}



	if (cclength % 2 != 0) {

		cclength += 1;

		ccNum = "0" + ccNum;

	}



	for (i = 0; i < cclength; i++) {

		digit = parseInt(ccNum.charAt(i));

		if ((i % 2) == 0) {

			digit *= 2;

			if (digit > 9)

				digit = parseInt(digit / 10) + parseInt(digit % 10);

		}

		checksum += digit;

	}





	if (checksum % 10 == 0)

		return(true);

	else

		return(false);

}



function setIssueCheck(Obj_SelectField,Obj_issuefield)

{

	var SelectValue = Obj_SelectField.options[Obj_SelectField.selectedIndex].value;

	if ( SelectValue == "switch" || SelectValue == "solo" || SelectValue == "delta" )

	{

		issueArray[3] = true;

	}

	else

	{

		issueArray[3] = false;

		Obj_issuefield.value = "";

	}



}



function isBlank(str) {return (str != "");}



function isAlpha(chr)

{

	chr = chr.toUpperCase();

	return !(chr < "A" || chr > "Z") //may need to make upper case? or use reg exp

}



function isNum(chr) {return !(chr < "0" || chr > "9");}



function isNumeric(str)

{

  var regex = /[^0-9-]/;

  return !/[^0-9-]/.test(StripSpaces(str));

}



function isEmail(str)

{

  var regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;

  return regex.test(str);

}



function StripSpaces(str) {return str.replace(/ /g, "");} // removes ALL spaces in a string



function AddSpace(str,charsright) // charsright is num of chars to leave at end

{

	var strlen=str.length;

	str=str.substring(0,strlen-charsright)+" "+str.substring(strlen-charsright,strlen);



	return str;

}



function CheckLength(str) // input is a string

{

	var strlen = str.length;

	return !( (strlen!=6) && (strlen!=7) && (strlen!=8) )

}



function FindSpace(str) {return (str.indexOf(" "));} // input is a string with a space



function GetFirstPart(str) // input is a string with one space, returns blank if no space

{

	var place = FindSpace(str);

	return (str.substring(0,place));

}



function GetSecondPart(str) // input is a string with one space, returns all if no space

{

	var place = FindSpace(str);

	var strlen = str.length;

	return (str.substring(place+1,strlen));

}



function CheckFirstPart(str) // check alpha & numerics is right place AND ensures length is valid

{

	str = GetFirstPart(str);

	var strlen = str.length;

	if ( isAlpha(str.charAt(0)) ) //A***

	{

		if ( isNum(str.charAt(1)) ) //A9**

		{

			if (strlen == 2)  // A9

				return true;

			else if ( (strlen == 3) && ( isNum(str.charAt(2)) || isAlpha(str.charAt(2)) ) ) // A99 or A9A

				return true

		}

		else if ( isAlpha(str.charAt(1)) ) //AA**

		{

			if ( isNum(str.charAt(2)) ) //AA9*

			{

				if (strlen == 3)  // AA99

					return true;

				else if ( (strlen == 4) && ( isNum(str.charAt(3)) || isAlpha(str.charAt(3)) ) )// AA99 or AA9A

					return true

			}

		}



	}

	return false

}



function CheckSecondPart(str)

{

	str = GetSecondPart(str);

	var strlen = str.length;

	if ( (strlen == 3) && (isNum(str.charAt(0))) && (isAlpha(str.charAt(1))) && (isAlpha(str.charAt(2))) )

		return true;

	else

		return false;

}



function FormatPC(str)

{

	str = str.toUpperCase();

	str = StripSpaces(str);

	str = AddSpace(str,3);

	return str;

}



function CheckPC(str)

{

	str = FormatPC(str);



	if ( CheckLength(str) && CheckFirstPart(str) && CheckSecondPart(str) )

		return true;

	else

		return false

}



function CheckTextField(Obj_TextField,ShowAlert)

{

	if (!isBlank(Obj_TextField.value))

	{

		if (ShowAlert)

		{

			alert (CheckArray[Obj_TextField.name] + " cannot be blank.");

			Obj_TextField.focus();

		}

		return false;

	}

	else

		return true;

}



function CheckSelectField(Obj_SelectField,ShowAlert)

{



	var TestValue = Obj_SelectField.options[Obj_SelectField.selectedIndex].value;

	if (TestValue < 0 || TestValue == "")

	{

		if (ShowAlert)

		{

			alert ("Please select a value for " + CheckArray[Obj_SelectField.name] + ".");

			Obj_SelectField.focus();

		}

		return false;

	}

	else

		return true;



}







function CheckForm(F,bSubmit)

{

	var i = 0;

	var FoundError = false;

	if ("" + bSubmit == "undefined")

		bSubmit = false;



	while (i < F.length && !FoundError)

	{

		var E = F.elements[i];



		if ((E.type == "text") || (E.type == "textarea") )

		{

			if (CheckArray[E.name] ) // required fields

			{

				if (!CheckTextField(E,true))

					FoundError = true;

			}



			if (pcCheckArray[E.name] && !FoundError) //check if postcode field

			{

				var PC = FormatPC(E.value);

				E.value = PC;

				if (!CheckPC(PC))

				{

					var PClen = PC.length;

					var newPC = PC;

					var Diff = 28 - PClen;

					if ( Diff > 0 )

						{

						for (var i=1;i<=Diff;i++)

							{

							newPC = " " + newPC;

							}

					    }



					alert(newPC + ' is not a valid postcode' + '\r\n' + 'Please enter in the form of XX XXX or XXX XXX or XXXX XXX' + '\r\n' + ' and ensure there are only Alpha and Numeric characters.');

					E.focus();

					FoundError = true;

				}

			}



			if ( (emailCheckArray[E.name] && CheckTextField(E)) || (emailCheckArray[E.name] && CheckArray[E.name]) && !FoundError)

			{

				if (!isEmail(E.value))

				{

					alert (emailCheckArray[E.name] + " is not a valid address.");

					E.focus();

					FoundError = true;

				}

			}



			if (numericCheckArray[E.name] && !FoundError)

			{

				if (!isNumeric(E.value))

				{

					alert (numericCheckArray[E.name] + " must be a number.");

					E.focus();

					FoundError = true;

				}

			}



			if (issueArray[0] == E.name && !FoundError)

			{

				if (issueArray[3] == true && !CheckTextField(E))

				{

					alert("Issue number cannot be blank");

					E.focus();

					FoundError = true;

				}

			}



			if (ccCheckArray[E.name] && !FoundError)

			{

				if (!CC_Validate(E.value,eval("F." + ccCheckArray[E.name][0] + ".value")))

				{

					alert (ccCheckArray[E.name][1] + " is not valid.");

					E.focus();

					FoundError = true;

				}

			}



		}

		else if (E.type == "select-one")

		{

			if (CheckArray[E.name] ) // required fields

			{

				if (!CheckSelectField(E,true)) // required fields

					FoundError = true;

			}

			if ((dateCheckArray[E.name] && CheckSelectField(E)) || (dateCheckArray[E.name] && CheckArray[E.name]) && !FoundError)

			{

				var YearElement = eval("F." + dateCheckArray[E.name][2] + ".value");

				var MonthElement = eval("F." + dateCheckArray[E.name][1] + ".value");

				var DayElement = eval("F." + dateCheckArray[E.name][0] + ".value");



				var TestDate = new Date(YearElement,MonthElement-1,DayElement)

				if ( (TestDate.getMonth() + 1) != MonthElement)

				{

					alert (dateCheckArray[E.name][3] + " is not valid.");

					E.focus();

					FoundError = true;

				}

			}



			if ((monthCheck[E.name] && CheckSelectField(E)) || (monthCheck[E.name] && CheckArray[E.name]) && !FoundError)

			{

				var YearElement = eval("F." + monthCheck[E.name][0] + ".value");

				var MonthElement = E.value;

				var dateToday = new Date();

				if ( (dateToday.getMonth() + 1) > MonthElement && dateToday.getYear() == YearElement)

				{

					alert (monthCheck[E.name][1] + " is not valid.");

					E.focus();

					FoundError = true;

				}

			}



		}

		i++;

	}



	if (!FoundError)

	{

		//F.date_of_birth.value = F.dobday.value + "/" + F.dobmonth.value  + "/" + F.dobyear.value;

		if (bSubmit)

		{

			F.submit();

		}

		else

			return true;

	}

	else if (!bSubmit)

		return false;





}