function beseder_advsorter_onsubmit_handler() {
	container = document.getElementById('beseder_cats');
	filter = document.getElementById('cat_filter');
	filter.value = "";
	
	chks = container.getElementsByTagName('input');
	for (i=0; i<chks.length; i++) {
		if (chks[i].type == 'checkbox' && chks[i].checked) {
			if (filter.value != "") filter.value += ',';
			filter.value += chks[i].name;
		}
	}
}