function vergroting(map, bestand, width, height) {
var winl = (screen.width - width) / 2;
var wint = (screen.height - height) / 2;
var vergroting = window.open('', 'Popup', 'height='+height+', width='+width+', left='+winl+', top='+wint+', toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no');
vergroting.document.open();
vergroting.document.write("Vergroting...![Click to close..](images/" + map + "/" + bestand + ")
");
vergroting.document.close();
vergroting.focus();
}