var emailFormat    = /^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i;
var postcodeFormat = /^[0-9]{4}[\s]*[a-z]{2}[\d\s]{0}$/i;
var telefoonFormat = /^[0-9]{3}[\s]*[\-]?[\s]*[0-9]{7}[\d\s]{0}$|^[0-9]{4}[\s]*[\-]?[\s]*[0-9]{6}[\d\s]{0}$/;
var mobielFormat   = /^06[\s]*[\-]?[\s]*[0-9]{7}[\d\s]{0}$/;

function formCheck (formName)
{
	var d = document;
	var errorMessage = '';

	if(d.getElementById('voornaam').value == '' || d.getElementById('voornaam').value.length < 2) {
		errorMessage += 'U dient een voornaam in te vullen.\n';
	}
	if(d.getElementById('achternaam').value == '' || d.getElementById('achternaam').value.length < 2) {
		errorMessage += 'U dient een achternaam in te vullen.\n';
	}
	if((d.getElementById('email').value == '' || !emailFormat.test(d.getElementById('email').value)) && ((d.getElementById('telefoon').value == '' || !telefoonFormat.test(d.getElementById('telefoon').value)) && (!mobielFormat.test(d.getElementById('telefoon').value)))) {
		errorMessage += 'U dient een e-mail adres of een vast of mobiel telefoonnummer in te vullen.\n';
	}
	if(d.getElementById('woonplaats').value == '' || d.getElementById('woonplaats').value.length < 2) {
		errorMessage += 'U dient een woonplaats in te vullen.\n';
	}

	if(errorMessage == '') {
		d.getElementById(formName).submit();
	} else {
		//d.getElementById('errortext').innerHTML = errorMessage + '<br/>';
		//d.getElementById('errortext').style.visibility = 'visible';
		alert("Er waren problemen met het formulier.\n"+errorMessage);
		return false;
	}
}

function formCheckBedrijven (formName)
{
	var d = document;
	var errorMessage = '';

	if(d.getElementById('contactpersoon').value == '' || d.getElementById('contactpersoon').value.length < 2) {
		errorMessage += 'U dient een contactpersoon op te geven.\n';
	}
	if((d.getElementById('email').value == '' || !emailFormat.test(d.getElementById('email').value)) && ((d.getElementById('telefoon').value == '' || !telefoonFormat.test(d.getElementById('telefoon').value)) && (!mobielFormat.test(d.getElementById('telefoon').value)))) {
		errorMessage += 'U dient een e-mail adres of een vast of mobiel telefoonnummer in te vullen.\n';
	}
	if(d.getElementById('referrer').selectedIndex == 0 || (d.getElementById('referrer').selectedIndex == 9 && d.getElementById('anders_input').value == '')) {
		errorMessage += 'U dient een referrer op te geven.\n';
	}

	if(errorMessage == '') {
		d.getElementById(formName).submit();
	} else {
		alert("Er waren problemen met het formulier.\n"+errorMessage);
		return false;
	}
}

function formCheckAanmeldEnglish(formName)
{
	return realFormCheckaanmelden(formName, 'en');
}

function formCheckAanmeld(formName)
{
	return realFormCheckaanmelden(formName, 'nl');
}

function realFormCheckaanmelden(formName, sprache)
{
	var d = document;
	var errorMessage = '';

	if(d.getElementById('voornaam').value == '' || d.getElementById('voornaam').value.length < 2) {
		if(sprache == 'en') {
			errorMessage += 'Enter a first name.\n';
		} else {
			errorMessage += 'U dient een voornaam in te vullen.\n';
		}
	}
	if(d.getElementById('achternaam').value == '' || d.getElementById('achternaam').value.length < 2) {
		if(sprache == 'en') {
			errorMessage += 'Enter a last name.\n';
		} else {
			errorMessage += 'U dient een achternaam in te vullen.\n';
		}
	}
	if(d.getElementById('email').value == '' || !emailFormat.test(d.getElementById('email').value)) {
		if(sprache == 'en') {
			errorMessage += 'Enter a valid e-mail address.\n';
		} else {
			errorMessage += 'U dient een e-mail adres in te vullen.\n';
		}
	}
	if(d.getElementById('telefoon').value == '') {
		if(sprache == 'en') {
			errorMessage += 'Enter a valid phone number.\n';
		} else {
			if(!telefoonFormat.test(d.getElementById('telefoon').value) && !mobielFormat.test(d.getElementById('telefoon').value)) {
				errorMessage += 'U dient een vast of mobiel telefoonnummer in te vullen.\n';
			}
		}
	}
	if((d.getElementById('dag').value == '' || d.getElementById('maand').value == '' || d.getElementById('jaar').value == '')) {
		if(sprache == 'en') {
			errorMessage += 'Enter a valid day of birth (note: in day-month-year format).\n';
		} else {
			errorMessage += 'U dient een geboortedatum in te voeren.\n';
		}
	}
	if(d.getElementById('woonplaats').value == '' || d.getElementById('woonplaats').value.length < 2) {
		if(sprache == 'en') {
			errorMessage += 'Enter a city of residence.\n';
		} else {
			errorMessage += 'U dient een woonplaats in te vullen.\n';
		}
	}
	var radioCounter = 0;
	var radioChecked = false;
	while(null != d.getElementById('opleiding_'+radioCounter)) {
		if(d.getElementById('opleiding_'+radioCounter).checked) {
			radioChecked = true;
		}
		radioCounter++;
	}
	if(!radioChecked) {
		if(sprache == 'en') {
			errorMessage += 'Enter your level of education.\n';
		} else {
			errorMessage += 'U dient uw opleidingsnivo in te vullen.\n';
		}
	}
	if(d.getElementById('studierichting').selectedIndex == 0) {
		if(sprache == 'en') {
			errorMessage += 'Enter your field of education.\n';
		} else {
			errorMessage += 'U dient uw studierichting in te vullen.\n';
		}
	}
	if(d.getElementById('afstudeertijd').selectedIndex == 0 || d.getElementById('afstudeerjaar').selectedIndex == 0 ) {
		if(sprache == 'en') {
			errorMessage += 'Enter your date of graduation.\n';
		} else {
			errorMessage += 'U dient uw afstudeerjaar in te vullen.\n';
		}
	}
	if(sprache == 'en' && d.getElementById('nationaliteit').selectedIndex == 0) {
		if(sprache == 'en') {
			errorMessage += 'Select your nationality.\n';
		}
	}

	if(d.getElementById('regio').selectedIndex == 0) {
		if(sprache == 'en') {
			errorMessage += 'Pick at least 1 region.\n';
		} else {
			errorMessage += 'Kies minimaal 1 regio.\n';
		}
	}
	
	if(d.getElementById('uren_per_week').selectedIndex == 0) {
		if(sprache == 'en') {
			errorMessage += 'Please indicatie your weekly availability.\n';
		} else {
			errorMessage += 'Geef het aantal beschikbare uren per week op.\n';
		}
	}

	if((d.getElementById('dag').value != '' && d.getElementById('maand').value != '' && d.getElementById('jaar').value != '')) {
		var day = d.getElementById('dag').value;
		var month = d.getElementById('maand').value
		var year = d.getElementById('jaar').value
		var fullDate = day+'-'+month+'-'+year;
		if(!isDate(fullDate)) {
			if(sprache == 'en') {
				errorMessage += 'Enter a valid date of birth.\n';
			} else {
				errorMessage += 'U dient een geldige geboortedatum in te voeren.\n';
			}
		} 
	}
	
	if(d.getElementById('referrer').selectedIndex == 0) {
		if(sprache == 'en') {
			errorMessage += 'Pick a referrer.\n';
		} else {
			errorMessage += 'Waar kent u ons van is niet ingevuld.\n';
		}
	}

	if(errorMessage == '') {
		d.getElementById(formName).submit();
	} else {
		if(sprache == 'en') {
			alert("The form contains one or more errors.\n"+errorMessage);
		} else {
		 	alert("Er waren problemen met het formulier.\n"+errorMessage);
		}
		return false;
	}
}

function showElse (theSelect)
{
	if(theSelect.selectedIndex == 15) {
		document.getElementById('anders').style.visibility = "visible";
		document.getElementById('anders_input').value = "";
	} else {
		document.getElementById('anders').style.visibility = "hidden";
		document.getElementById('anders_input').value = "nvt.";
	}
}

function showElseCompany (theSelect)
{
	if(theSelect.selectedIndex == 9) {
		document.getElementById('anders').style.visibility = "visible";
		document.getElementById('anders_input').value = "";
	} else {
		document.getElementById('anders').style.visibility = "hidden";
		document.getElementById('anders_input').value = "nvt.";
	}
}

var dtCh = "-";
var minYear = 1900;
var maxYear = 2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   }
   return this
}

function isDate(dtStr) {
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
return true
}

function NewWindow(mypage,myname,w,h,scroll)
{
	var win= null;
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	var settings  ='height='+h+',';
		settings +='width='+w+',';
		settings +='top='+wint+',';
		settings +='left='+winl+',';
		settings +='scrollbars='+scroll+',';
		settings +='resizable=no';
	win=window.open(mypage,myname,settings);
	win.window.focus();
}