function topicsSearch() {
	var url;
	var year = document.topicsSelecter.year.value;
	var month = document.topicsSelecter.month.value;
	var category = document.topicsSelecter.category.value;
	var connection = ( month && category ) ? '_' : '';
	var extension = ( month || category ) ? '.htm' : '';
	url = '/topics/' + year + '/' + month + connection + category + extension;
	location.href = url;
}