//constraint methods
	function objConstraintRef(){
		var me=this;
		var constraints = new Array();

		me.add = function(name, func){
			constraints[name] = func;
		};

		me.get = function(name){
			return(constraints[name]);
		};
	}

	function objArg(value, type, isInputValue){
		this.toString = function(inputValue){
			var val = (isInputValue) ? inputValue : value ;
			return (type == "String" ) ? "'" + val + "'": val ;
		}
	}

	function objConstraint(name){
		var me=this;
		me.name = name;
		var args = new Array();

		me.add = function(value, type, isInputValue){
			indx = args.length;
			args[indx] = new objArg(value, type, isInputValue);
			return(args[indx]);
		}

		me.test = function(inputValue){
			inputValue = inputValue.replace("'", "\\'");

			var strArgs = "";
			for (var i=0; i<args.length; i++){
				strArgs += args[i].toString(inputValue) + ", ";
			}

			strArgs = (strArgs.length > 0) ? strArgs.substring(0, strArgs.length-2) : "";
			return(eval("constraintRef.get('" + me.name + "')(" + strArgs + ");"));
		}
	}

	function objInput(field_name, element_name, err_msg){
		var me=this;
		me.name = element_name;
		me.field_name = field_name;
		me.err_msg = err_msg;
		var constraints = new Array();


		me.clear = function(){
			constraints = new Array();			
		}

		me.add = function(name){
			var indx = constraints.length;
			constraints[indx] = new objConstraint(name);
			return(constraints[indx]);
		}

		me.getElementByName = function(){
			var elems = document.getElementsByName(me.name);
			for (var i=0; i<elems.length; i++){
				if (elems[i].checked){
					return(elems[i]);
				}
			}		
		}


		me.test = function(){
			var elem = document.getElementById(me.name);

			if (elem == null){
				elem = me.getElementByName();
			}else if(elem.type == "radio"){
				elem = me.getElementByName();
			}

			if (!elem){
				//if this has constraints it has to fail when we can't find it
				return (constraints.length > 0 ? false : true);
			}
			//don't pass the value for unchecked checkboxes or radio buttons
			val = (elem.type=='checkbox' || elem.type=='radio' ? (elem.checked ? elem.value : "" ) : elem.value);

			var isOk=true;
			for (var i=0; i<constraints.length; i++){
				if (!constraints[i].test(val)){
					isOk=false;
				}
			}
			return(isOk);		
		}
	}

	function objForm(){
		var me=this;
		var inputs = new Array();

		me.add = function(field_name, html_name, err_msg){
			var indx=inputs.length;
			inputs[indx] = new objInput(field_name, html_name, err_msg);
			return(inputs[indx]);
		}

		me.get = function(name){
			for (var i=0; i<inputs.length;i++){
				if (inputs[i].name == name){
					return inputs[i];
				}
			}	
			return false;
		}

		me.getElement = function(name){
			for (var i=0; i<inputs.length;i++){
				if (inputs[i].field_name == name){
					var elem = document.getElementById(inputs[i].name);
					return elem;
				}
			}	
			return false;
		}

		me.test = function(){
			var isOk=true;
			var err_msg = "";
			for (var i=0; i<inputs.length; i++){
				if (!inputs[i].test()){
					err_msg += inputs[i].err_msg + "\n";
					isOk=false;
				}
			}
			
			if (!isOk){
				alert(err_msg);
			}
			return(isOk ? true : false);
		}
	}

	var constraintRef = new objConstraintRef();
	
	
	constraintRef.add("Check Test", function(input, fieldNames){
	function isSet(val){
		val += "";
		return (val=="undefined"||val=="null") ? 0 : 1;
	}
	var names = fieldNames.split(",");
	var numChecked = 0;
	for (var i=0; i < names.length; i++){
		var element = form.getElement(names[i]);
		if (isSet(element) && element.checked){
			numChecked++;
		}
	}
	return (numChecked > 0 ? true : false);
} );
	
	constraintRef.add("CheckBox Checked Limit", function(input, fieldNames,limit){
	function isSet(val){
		val += "";
		return (val=="undefined"||val=="null") ? 0 : 1;
	}
	var names = fieldNames.split(",");
	var numChecked = 0;
        alert( "number checked is:" + numChecked);
	for (var i=0; i < names.length; i++){
		var element = form.getElement(names[i]);
		if (isSet(element) && element.checked){
			numChecked++;
		}
	}
        alert( "number checked is:" + numChecked);
	return (numChecked > limit ? true : false);
} );
	
	constraintRef.add("Does Not Equal", function (input, value){
  return(input != value ? true : false);
});
	
	constraintRef.add("Equals", function (input, value){
  return(input == value ? true : false);
});
	
	constraintRef.add("Greater Than", function (input, value){
  return(input > value ? true : false);
});
	
	constraintRef.add("Is Alpha Numeric", function (str){
  var re = new RegExp("([A-Z|a-z|0-9| ]*)", "");
  re.exec(str);
  return( RegExp.$1.length == str.length ? true : false);
});
	
	constraintRef.add("Is DOB", function (input, min, max){

//	min = (min == null ? "" : min);
//	max = (max == null ? "" : max);

	function fixYear(year){
		if (document.all&&document.getElementById){
			return year < 1900 ? year + 1900 : year;
		}else{
			return year < 1900 ? year + 1900 : year;		
		}
	}

	function splitDateStr(dateStr, delimiter){
		var dateParts = null;
		if (dateStr.indexOf(delimiter) > 0){
			dateParts = dateStr.split(delimiter);
		}	
		return dateParts;
	}

	function getDatePartsFromString(dateStr){
		var dateParts;
		var i = 0;
		var delimiters = new Array();
		delimiters[delimiters.length] = "/";
		delimiters[delimiters.length] = "\\";
		delimiters[delimiters.length] = "-";
		delimiters[delimiters.length] = " ";
		delimiters[delimiters.length] = ".";
		delimiters[delimiters.length] = "_";
		delimiters[delimiters.length] = "!";
		while ( (dateParts=splitDateStr(dateStr, delimiters[i++])) == null && i < delimiters.length){}
		return dateParts;
	}

	var test = false;
	if (input == ""){
		return true;
	}

	var dateParts = getDatePartsFromString(input);
	if (dateParts != null && dateParts.length == 3 && dateParts[2] != "") {
		dateParts[0] = dateParts[0]*1;
		dateParts[1] = dateParts[1]*1-1;
		dateParts[2] = fixYear(dateParts[2]*1);

		var date = new Date();
		date.setDate( dateParts[0] );
		date.setMonth( dateParts[1] );
		date.setYear( dateParts[2] );
		date.setHours(0);
		date.setMinutes(0);
		date.setSeconds(0);
		date.setMilliseconds(0);

		if (date.getDate() == dateParts[0] && date.getMonth() == dateParts[1] && fixYear(date.getYear()) == dateParts[2]){
			test = true;

			var maxLimit = new Date();
			if (max != null){
				maxLimit.setYear( fixYear(fixYear(maxLimit.getYear()) - max));
				if ( (date.getTime() - maxLimit.getTime()) <= 0){
					test = false;
				}
			}

			var minLimit = new Date();
			if (min !=null){
				minLimit.setYear( fixYear(fixYear(minLimit.getYear()) - min));
				if ( (minLimit.getTime() - date.getTime()) <= 0){
					test = false;
				}
			}
		}
	}
	return test;
});
	
	constraintRef.add("Is Email", function (str){
  var re = new RegExp("^([A-Za-z0-9\\.\\-\\_]*@[A-Za-z0-9\\.\\-\\_]*)", "");
  re.exec(str);
  return( RegExp.$1 == str ? true : false);
}
);
	
	constraintRef.add("Is Numeric", function (str){
  var re = new RegExp("([0-9| ]*)", "");
  re.exec(str);
  return( RegExp.$1.length == str.length ? true : false);
});
	
	constraintRef.add("Is SCOTS Master ID", function (input) {
 return true;
});
	
	constraintRef.add("Less Than", function (input, value){
  return(input < value ? true : false);
});
	
	constraintRef.add("Max Size", function (input, value){
  return(input.length <= value ? true : false);
});
	
	constraintRef.add("Not Empty", function (input) {
  input+="";
  return(input == "" ? false : true);
});
	
	constraintRef.add("Radio Button Test", function(input, fieldName) {
	function isSet(val) {
		val += "";
		return (val=="undefined"||val=="null") ? 0 : 1;
	}

	var radioButton = document.getElementsByName(fieldName);
	var numChecked = 0;
	for (var i=0; i < radioButton.length; i++) {
		var element = radioButton[i];
		if (isSet(element) && element.checked) {
			numChecked++;
		}
	}

	return (numChecked > 0 ? true : false);
});
	
	constraintRef.add("Radio Double Test", function(input, name, testValue, fieldName){
	if (input == testValue){
		var field = form.getElement(fieldName);
		return (field.value == "" ? false : true);
	}
	return true;
});
	

	var form = new objForm();
			var input = form.add('family_guide','DYNFRM-column1', 'null');
		var input = form.add('blank_space','DYNFRM-column31', 'null');
		var input = form.add('title','DYNFRM-column3', 'Please select your title.');
		var constraint = input.add('Does Not Equal');
		constraint.add(null, 'String', true);
		constraint.add('-1', 'String', false);
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('firstname','DYNFRM-column4', 'Please enter a first name.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('lastname','DYNFRM-column5', 'Please enter a surname.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('address1','DYNFRM-column6', 'Please enter the first line of your address.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('address2','DYNFRM-column7', 'null');
		var input = form.add('address3','DYNFRM-column8', 'null');
		var input = form.add('town','DYNFRM-column9', 'Please enter a town.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('county','DYNFRM-column10', 'null');
		var input = form.add('postcode','DYNFRM-column11', 'Please enter a postcode.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('country','DYNFRM-column12', 'Please select a country.');
		var constraint = input.add('Does Not Equal');
		constraint.add(null, 'String', true);
		constraint.add('-1', 'String', false);
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('note','DYNFRM-column33', 'null');
		var input = form.add('phone','DYNFRM-column13', 'null');
		var input = form.add('email','DYNFRM-column14', 'Please enter a valid email address.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var constraint = input.add('Is Email');
		constraint.add(null, 'String', true);
		var input = form.add('crm_age_range','DYNFRM-column15', 'Please select your age range.');
		var constraint = input.add('Does Not Equal');
		constraint.add(null, 'String', true);
		constraint.add('-1', 'String', false);
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('child_age','DYNFRM-column16', 'null');
		var input = form.add('under_5','DYNFRM-column17', 'null');
		var input = form.add('child_5_12','DYNFRM-column18', 'null');
		var input = form.add('child_13','DYNFRM-column19', 'null');
		var input = form.add('crm_whenlastLabel','DYNFRM-column20', 'null');
		var input = form.add('crm_lastMonth','DYNFRM-column21', 'Please fill in the month of your last break in Scotland.');
		var constraint = input.add('Does Not Equal');
		constraint.add(null, 'String', true);
		constraint.add('-1', 'String', false);
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('crm_lastYear','DYNFRM-column22', 'Please fill in the year of your last break in Scotland.');
		var constraint = input.add('Does Not Equal');
		constraint.add(null, 'String', true);
		constraint.add('-1', 'String', false);
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('crm_visitFrequency_label','DYNFRM-column23', 'null');
		var input = form.add('crm_visitFrequency','DYNFRM-column24', 'null');
		var input = form.add('dp_label','DYNFRM-column25', 'null');
		var input = form.add('dp_vsoffers_label','DYNFRM-column26', 'null');
		var input = form.add('dp_vsoffers','DYNFRM-column27', 'Please complete the first data protection question.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);
		var input = form.add('dp_thirdparty_label','DYNFRM-column28', 'null');
		var input = form.add('dp_thirdparty','DYNFRM-column29', 'Please complete the second data protection question.');
		var constraint = input.add('Not Empty');
		constraint.add(null, 'String', true);



	function validate(){
		return(form.test());
	}