// Verander class na bv. een mouseover effect
function NewClass(obj, new_style) {
    obj.className = new_style;
};

//Image Rollover
function imageRollover (id, img, doc){
	if (! (doc)){doc= window.document;}
	if (doc.images){doc.images[id].src= img;}
};

//Rollover Image
function rolloverImage (id, img, doc){
	imageRollover (id, img, doc);
};

//Open window in midden van het beeldscherm
var win = null;
function NewWindow(mypage,myname,w,h,r,s){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',resizable='+r+',scrollbars='+s
win = window.open(mypage,myname,settings)
};

function NewWindow2(mypage,myname,w,h){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars'
win = window.open(mypage,myname,settings)
};

//Controle of veld niet leeg is
function FieldNotEmpty (formelement, message) {
	function stripSpaces(x) {while (x.substring(0,1) == ' ') x = x.substring(1); return x;};
	function empty(x) { if (x.length > 0) return false; else return true; };
	function stripSpaces(x) { return x.replace(/^\W+/,''); };
	if (empty(stripSpaces(formelement.value))) {
		alert(message);
		formelement.focus();
		formelement.select();
		return false;
	}
};
//Check if message exceeds defined length
function CheckLength (formelement, countmin, countmax, message) {
		if (formelement.value.length < countmin || formelement.value.length > countmax ) {
			count = formelement.value.length;
			alert(message+"\r\n\Het aantal ingevoerde karakters is: "+count);
			formelement.focus();
			formelement.select();
			return false;
		}
};
//Controle op geldig e-mailadres
function ValidEmail (formelement, message) {
	if (formelement.value == "" ) {return true;}
	else {
	    if  (formelement.value.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1){
			alert(message);
			formelement.focus();
			formelement.select();
			return false;
		}
	}
};

function ValidSelection(formelement,jsmessage) {
  if (formelement.selectedIndex == 0) {
    alert(jsmessage);
    return false;
  }
  return true;
};
//Check if field is empty. If not value must be in valid dateformat.
function ValidDateRequired (formelement, message) {
	//Check if dateformat is valid; Dutch format is dd-mm-yyyy
	var dateStr = formelement.value;
	var strErr=0;
	var datename = new Date();
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;
	var matchArray = dateStr.match(datePat);
	if (matchArray == null) {
		alert(message);
		strErr=1;
		formelement.select();
		return false;
	}
	month = matchArray[3];
	day = matchArray[1];
	year = matchArray[4];
	if (month < 1 || month > 12) {
		alert(message);
		strErr=1;
		formelement.select();
		return false;
	}
	if (day < 1 || day > 31) {
		alert(message);
		strErr=1;
		formelement.select();
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		alert(message);
		strErr=1;
		formelement.select();
		return false;
	}
	if (month == 2) {
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day>29 || (day==29 && !isleap)) {
			alert(message);
			strErr=1;
			formelement.select();
			return false;
		}
	}
};
function RadioNotEmpty(formelement,message) {
    for (var i=0;i<formelement.length;i++) {
        if (formelement[i].checked)
            return true;
    }
    alert(message);
    return false;
};