var checkflag = "false";

function check(field) {
if (checkflag == "false") {
  for (i = 0; i < field.length; i++) {
  field[i].checked = true;}
  checkflag = "true";
  return " keine "; }
else {
  for (i = 0; i < field.length; i++) {
  field[i].checked = false; }
  checkflag = "false";
  return " alle "; }
}

function CheckAll(frm) {

	for (i = 0; i < frm.elements.length; i++) {		
		var e = frm.elements[i];
		if ((e.name != 'allbox') && (e.type=='checkbox')) {		
			e.checked = frm.allbox.checked;
		}
	}
}