function filter_news() {
	var categories = '';
	var branche = document.getElementById('branchen_filter').value;
	var bezirk = document.getElementById('bezirks_filter').value;
	
	categories = bezirk + ',' + branche;
	
	window.location = document.getElementById('filter-formular').action+'?id=20&no_cache=1&tx_ttnews[cat]='+categories;
}