function setOptions(chosen) {
	var selbox = document.zoeken.type;
 	selbox.options.length = 0;
	if (chosen == "") {
		selbox.options[selbox.options.length] = new Option('= alle bouwtypes =','1,2,3,4');
	}
	if (chosen == "1") {
		selbox.options[selbox.options.length] = new
		Option('Alle eengezinswoningen','1');
		selbox.options[selbox.options.length] = new
		Option('Vrijstaande woning','10101');
		selbox.options[selbox.options.length] = new
		Option('Schakelwoning','10102');
		selbox.options[selbox.options.length] = new
		Option('Helft van dubbel','10103');
		selbox.options[selbox.options.length] = new
		Option('Tussenwoning','10104');
		selbox.options[selbox.options.length] = new
		Option('Hoekwoning','10105');
	}
				
	if (chosen == "2") {
		selbox.options[selbox.options.length] = new
		Option('Alle appartementen','2');
		selbox.options[selbox.options.length] = new
		Option('Bovenwoning','20201');
		selbox.options[selbox.options.length] = new
		Option('Benedenwoning','20203');
		selbox.options[selbox.options.length] = new
		Option('Maisonette','20204');
		selbox.options[selbox.options.length] = new
		Option('Galerijflat','20205');
		selbox.options[selbox.options.length] = new
		Option('Portiekflat','20206');
	}
				
	if (chosen == "3") {
		selbox.options[selbox.options.length] = new
		Option('Overige','3,4');
		selbox.options[selbox.options.length] = new
		Option('Bouwgrond','3');
		selbox.options[selbox.options.length] = new
		Option('Garagebox','4');
	}
}