function chk_all(input_class,label) {

	var str = document.getElementById(label).innerHTML;
	str = (str != "Выбрать все" ? "Выбрать все" : "Отменить все");
	document.getElementById(label).innerHTML = str;

	var status = document.getElementById('status').checked;
	var check = document.getElementsByTagName('input');
	for (var i=0; i<check.length; i++) {
	if (check[i].type=='checkbox' && check[i].className==input_class) {
			check[i].checked = status;
		}
	}
}

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