function addMarker(map, lat, long, name, adres, beschrijving, open){

	var latlong =  new google.maps.LatLng(lat, long);
	var marker = new google.maps.Marker({
		position: latlong,
		map: map,
		title: name,
		clickable: true
	});

	var contentString = '<div style="width: 300px; height:150px;"><strong>'+name+'</strong><br />'+adres+'<br />'+beschrijving+'</div>';
	var infoWindow = new google.maps.InfoWindow({
		content: contentString
	});

	google.maps.event.addListener(marker, 'click', function() {
		infoWindow.open(map,marker);
	});
	
	if(open){
		infoWindow.open(map,marker);
	}
}