function filter_news()
{
	var categories = '';
	var subject = document.getElementById('thema');
	// nun weitere Felder auslesen, z.B. Medientyp
	//var mediaType = document.getElementById('medienTyp');
	//var author = document.getElementById('author');
 
	categories = subject.value;
	//+ ',' + mediaType + ',' + author;
 
	// neue URL mit Variable 'categories' zusammen setzen
	window.location = document.getElementById('filter-formular').action + 'kategorie/' + categories.toLowerCase().split(' ').join('-') + '/?tx_ttnews[swords]=%';
}