function toggle(obj , num) {
	for (i=1;i<=num;i++) {
		var now = i;
		var todo = 'nieuwsitem_' + now;
		var hide = document.getElementById(todo);
		
		if ( hide.style.display != 'none' ) {
			hide.style.display = 'none';
		}
	}

	var active = 'nieuwsitem_' + obj;
	
	var el = document.getElementById(active);
	
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}

}

function writeCookie() {
	var today = new Date();
	var the_date = new Date("December 31, 2023");
	var the_cookie_date = the_date.toGMTString();
	var the_cookie = "res="+ screen.width +"x"+ screen.height;
	var the_cookie = the_cookie + ";expires=" + the_cookie_date;
	document.cookie=the_cookie;
}

function filter(obj, num) {
	
	if(obj != 'off') {
	
		for(i = 1; i <= num; i++) {
			var todo = 'collectie_' + i;
			var hide = document.getElementById(todo);
			hide.style.display = 'none';
		}
	
		var todo = 'collectie_' + obj;
		var hide = document.getElementById(todo);
		hide.style.display = '';
		
	} else {
		for(i = 1; i <= num; i++) {
			var todo = 'collectie_' + i;
			var hide = document.getElementById(todo);
			hide.style.display = '';
		}
	}

}

function popup(url, w, h) {
	window.open(url, 'pimg',  'width=' + w + ',height='+ h + ',scrollbars=no,toolbar=no,location=no');
}