function setCheckboxes(status) {
	for (var i = 0; i < document.list.length; i++) {
		document.list.elements[i].checked = status;
	}
}
function Confirm() {
	return window.confirm('Вы уверены ?');
}

function showhide(el, el_text, text_show, text_hide) {
	if (el.style.display == 'none') {
		el.style.display = 'block';
		el_text.innerHTML = text_hide;
	} else {
		el.style.display = 'none';
		el_text.innerHTML = text_show;
	}
}

function calc(el, act) {
	if (act == 1) {
		$(el).value++;
	} else {
		$(el).value--;
		if ($(el).value < 0) $(el).value = 0;
	}
}