var mPrefix="U bent vergeten het veld '"
		var mPrefix2="Het veld: '"
		var mSuffix="' in te vullen."
		var mSuffix2="' is foutief ingevuld."
		var whitespace = " \t\n\r";
		var digitsInUSPhoneNumber = 10;
		var phoneNumberDelimiters = "()- ";

		CityCode = new Array("010","020","030","040","050","060","070","080","090");

		function warnEmpty (theField, s, isDiv)
		{   if(isDiv == 0){theField.focus()}
			alert(mPrefix + s + mSuffix)
		    return false
		}

		function warnInvalid (theField, s)
		{   theField.focus()
		    theField.select()
		    alert(mPrefix2 + s + mSuffix2)
		    return false
		}

		function isEmpty(s)
		{   return ((s == null) || (s.length == 0))
		}


		function isWhitespace (s)

		{   var i;

		    if (isEmpty(s)) return true;

		    for (i = 0; i < s.length; i++)
		    {
		        var c = s.charAt(i);

		        if (whitespace.indexOf(c) == -1) return false;
		    }

		    return true;
		}

		function checkEmail (theField, s)
		{   if (isEmpty(theField.value)) return warnEmpty (theField, s) ;
		    else if (!isEmail(theField.value, false))
		       return warnInvalid (theField, s);
		    else return true;
		}

		function isEmail (s)
		{   if (isEmpty(s))
		       if (isEmail.arguments.length == 1) return defaultEmptyOK;
		       else return (isEmail.arguments[1] == true);

		    if (isWhitespace(s)) return false;

		    var i = 1;
		    var sLength = s.length;

		    while ((i < sLength) && (s.charAt(i) != "@"))
		    { i++
		    }

		    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
		    else i += 2;

		    while ((i < sLength) && (s.charAt(i) != "."))
		    { i++
		    }

		    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
		    else return true;
		}

		function checkString (theField, s, isDiv){
			if (isWhitespace(theField.value))
		       return warnEmpty (theField, s,isDiv);
		    else return true;
		}



		function CheckBoxChecked(theField,s){

			for (i=0; i<theField.length; i++) {
				if (theField[i].checked) {
					return true;
				}
			}
			alert(mPrefix + s + mSuffix);
			return false;
		}

		function isPostCode(theField, s) {
			if (isEmpty(theField.value)){
				return warnEmpty (theField, s);
			}
			else{
				var Str=theField.value
				if (Str.length < 6 || Str.length > 7){
					return warnInvalid (theField, s);
				}
				else if(Str.length == 7){
					if (whitespace.indexOf(Str.charAt(4)) == -1){
						return warnInvalid (theField, s);
					}
				}
				for (i = 0 ; i < 4; i++){
					var c = Str.charAt(i);
					if (!isDigit(c)) return warnInvalid (theField, s);
				}

				for (i = Str.length-2; i < Str.length; i++){
					var c = Str.charAt(i);
					if (!isLetter(c)) return warnInvalid (theField, s);
				}
				//theField.value = reformatPostCode(Str)
				return true
			}
		}



		function isLetter (c){
			return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) )
		}

		function isDigit (c){
			return ((c >= "0") && (c <= "9"))
		}


		function isCityNum (PhoneNum){
			c=PhoneNum.substr(0,3);
			for (i = 0; i < CityCode.length ; i++){
				if (c == CityCode[i]) return true;
			}
			return false;
		}

		function reformatPhoneNum (PhoneNum){
			if (isCityNum(PhoneNum)){
				return (reformat (PhoneNum, "(", 3, ") ", 3, " ", 2, " ", 2))
			}
			else{
				return (reformat (PhoneNum, "(", 4, ") ", 2, " ", 2, " ", 2))
			}
		}


		function isPhoneNum (theField, s){
			if (isEmpty(theField.value)){
				return warnEmpty(theField,s);
			}
		    else{
		    var normalizedPhone = stripCharsInBag(theField.value, phoneNumberDelimiters);
		       if (!isPhoneNumber(normalizedPhone))
		          return warnInvalid (theField, s);
		       else {  // if you don't want to reformat as (123) 456-789, comment next line out
		          theField.value = reformatPhoneNum(normalizedPhone);
		          return true;
		       }
		    }
		}

		function reformat (s)

		{   var arg;
		    var sPos = 0;
		    var resultString = "";

		    for (var i = 1; i < reformat.arguments.length; i++) {
		       arg = reformat.arguments[i];
		       if (i % 2 == 1) resultString += arg;
		       else {
		           resultString += s.substring(sPos, sPos + arg);
		           sPos += arg;
		       }
		    }
		    return resultString;
		}


		function isPhoneNumber (s){
			if (s.charAt(0) != 0) return false;
			return (isInteger(s) && s.length == digitsInUSPhoneNumber)
		}

		function isInteger(s){
			for (i = 0; i < s.length; i++){
		        var c = s.charAt(i);
		        if (!isDigit(c)) return false;
		    }
		    return true
		}

		function stripCharsInBag (s, bag)

		{   var i;
		    var returnString = "";

		    for (i = 0; i < s.length; i++)
		    {
		        var c = s.charAt(i);
		        if (bag.indexOf(c) == -1) returnString += c;
		    }

		    return returnString;
		}

		function changeToUpperCase(theField){
			c=theField.value ;
			c=c.toUpperCase();
			theField.value=c;
		}