var checkflag = "false";
function check(field) {
	if (checkflag == "false") {
	for (i = 0; i < field.length; i++) {
	field[i].checked = true;}
	checkflag = "true";
	return "Valikud maha"; }
	else {
	for (i = 0; i < field.length; i++) {
	field[i].checked = false; }
	checkflag = "false";
	return "Vali kõik"; }
}