function selectAllCities(){
	var elts      = document.form_menu.elements['orte[]'];
    var elts_cnt  = elts.length;

    for (var i = 0; i < elts_cnt; i++) {
        elts[i].checked = true;
    }
}
function unselectAllCities() {
	var elts      = document.form_menu.elements['orte[]'];
    var elts_cnt  = elts.length;

    for (var i = 0; i < elts_cnt; i++) {
        elts[i].checked = false;
    }	
}
function selectAllCantones(){
	var elts      = document.form_kantone.elements['kantone[]'];
    var elts_cnt  = elts.length;

    for (var i = 0; i < elts_cnt; i++) {
        elts[i].checked = true;
    }
}
function unselectAllCantones() {
	var elts      = document.form_kantone.elements['kantone[]'];
    var elts_cnt  = elts.length;

    for (var i = 0; i < elts_cnt; i++) {
        elts[i].checked = false;
    }	
}