function check_all() {

	for (i = 0; i < document.group_manage.elements.length; i++) {
		if (document.group_manage.elements[i].name == 'member[]') {
			document.group_manage.elements[i].checked = true;
		}
	}
}

function release_all() {

	for (i = 0; i < document.group_manage.elements.length; i++) {
		if (document.group_manage.elements[i].name == 'member[]') {
			document.group_manage.elements[i].checked = false;
		}
	}
}