// установка cookie
function setCookie(name, value, expire){
	document.cookie = name + "=" + escape(value) + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()));
}

// получения значения cookie
function getCookie(Name) {
	var search = Name + "=";

	if (document.cookie.length > 0) { // if there are any cookies
		offset = document.cookie.indexOf(search);
		if (offset != -1) { // if cookie exists
			offset += search.length;
			// set index of beginning of value
			end = document.cookie.indexOf(";", offset);
			// set index of end of cookie value
			if (end == -1)
				end = document.cookie.length;
			return unescape(document.cookie.substring(offset, end));
		}
	}
}

// функция проверки наличия товара в корзине
function chkBasket(){
	var basket_cookie = getCookie("basket");

	if (basket_cookie == 1){
		document.getElementById("shop").style.display = "block";
	} else {
		document.getElementById("shop").style.display = "none";
	}
}

// функция добавления/удаления позиции в cookie	
function selectPos(id_pos){
	var today = new Date();
	var expires = new Date();
	var tid_cookie = getCookie("tid");
	var re = new RegExp(id_pos+",");

	if (re.exec(tid_cookie)){
		new_tid_cookie = tid_cookie.replace(re, "");
	} else {
		new_tid_cookie = tid_cookie;
		new_tid_cookie += escape(id_pos) + ",";
	}
	expires.setTime(today.getTime() + 60*60*24);
	setCookie("tid", new_tid_cookie, expires);
	if (new_tid_cookie.length > 0){
		setCookie("basket", "1", expires);
	} else {
		setCookie("basket", "0", expires);
	}
	chkBasket();
}

// функция выбора картинки
function selectImg(id_pos, obj){
	var tid_cookie = getCookie("tid");
	var re = new RegExp(id_pos+",");

	if (re.exec(tid_cookie)){
		obj.src = "/img/ico/basket.gif";
	} else {
		obj.src = "/img/ico/ok.gif";
	}
}