<!--

var defaultEmptyOK = false;
var whitespace = " \t\n\r";
var mPrefix = "Het veld "
var mSuffix = " is leeg.\nDit is een verplicht veld. Vul dit veld alsnog in."
var decimalPointDelimiter = ","

function y2k(number) { return (number < 1000) ? number + 1900 : number; }

function isDate(day,month,year) 
{
    var today = new Date();
    year = ((!year) ? y2k(today.getYear()):year);
    month = ((!month) ? today.getMonth():month-1);
    if (!day) return false
    var test = new Date(year,month,day);
    if ( (y2k(test.getYear()) == year) &&
         (month == test.getMonth()) &&
         (day == test.getDate()) )
        return true;
    else
        return false
}

function makeDate(Day, Month, Year)
{
	
	Day = Day.value.toString();
	Month = Month.value.toString();
	Year = Year.value.toString();
	
	if(Day == "" && Month == "" && Year == "")
	{
		sValue = ""
		return sValue;
	}
	
	if(Day == "")
	{
		alert('Dag is niet ingevuld');
		return 'false';
	}
	if(Month == "")
	{
		alert('Maand is niet ingevuld');
		return 'false';
	}
	if(Year == "")
	{
		alert('Jaartal is niet ingevuld');
		return 'false';
	}
	if(isNaN(Year))
	{
		alert('Jaartal is niet numeriek');
		return 'false';
	}
	if(Year.length != 4)
	{
		alert("Jaartal dient uit 4 cijfers te bestaan");
		return 'false';
	}
	
	var sDateReturn = Month + "/" + Day + "/" + Year;
	
	
	if (!isDate(Day,Month,Year))
	{
		alert('U heeft geen juiste datum opgegeven');
		return 'false';
	}
	else
	{
		return sDateReturn;
	}

}

function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

function isDigit (c)
{   return ((c >= "0") && (c <= "9"))
}

function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

function IsNum(Field) 
{
    theNum = parseFloat(Field.value);
    if (Field.value != '' + theNum)
    {
       return false;
       }
    return true;
}

function IsEmail(oField, layoutName)
{
	var sErrorMessage = 'Het E-mailadres is geen geldig e-mailadres';
	
	if(oField.value == "")
		return true;
		
	var x = oField.value
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9])+$/;
	if (filter.test(x))
	{
		return true;
	}
	else
	{
		
		alert(sErrorMessage);
		oField.focus();
		return false;
	}
}
function checkString (theField, s, emptyOK)
{   
    if (checkString.arguments.length == 2) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    else return true;
}

function checkRadioButton(oField, layoutName)
{
	for(i=0;i<oField.length;i++)
	{
		if(oField[i].checked == true)
			return true;
	}
	alert(mPrefix + layoutName + ' is een verplicht veld. Vul dit veld alsnog in.');

	return false;
}


function checkCheckBox(oField, layoutName)
{
	var iLength;
	iLength = oField.length;
	
	if(!oField.length)
	{
		if(oField.checked == false)
		{
			alert(mPrefix + layoutName + " moet aangevinkt zijn.");
			return false;
		}
	}
	else
	{
		for(i=0;i<oField.length;i++)
		{
			if(oField[i].checked == true)
				return true;
		}
		alert("Er moet minimaal een " + layoutName + " aangevinkt zijn.");
		return false;
	}
	
	return true;

}

function warnEmpty (theField, s)
{  
	theField.focus()
    alert(mPrefix + s + mSuffix)
    return false
}

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 checkNumeriek(theField, s)
{
    if (IsNum(theField) == false)
    {
		theField.focus();
		theField.select();
	 	alert(mPrefix + s + " mag alleen cijfers bevatten.");
       	return false;
    }
	else return true;

}
//-->