function ch_menu () {
	menu_img = document.getElementById('menu-control');
	menu_content = document.getElementById('menu');
	menu_feedback = document.getElementById('menu-feedback');
	
	if (menu_content.style.display != 'none') {
		menu_content.style.display = 'none';
		menu_img.src = '/i/show-menu.jpg';
		menu_feedback.style.display = 'block';
		
		save_cookie(1);
	} else {
		menu_content.style.display = 'block';
		menu_img.src = '/i/hide-menu.jpg';
		menu_feedback.style.display = 'none';
		
		save_cookie(0);
	}
}

function check_menu () {
	var cookie_value = get_cookie('tehenergo.ru_menu_hidden');
	
	if (cookie_value == 1) {
		menu_img = document.getElementById('menu-control');
		menu_content = document.getElementById('menu');
		menu_feedback = document.getElementById('menu-feedback');
		
		menu_content.style.display = 'none';
		menu_img.src = '/i/show-menu.jpg';
		menu_feedback.style.display = 'block';	
	}
}

function set_cookie(name, value, expires) {
	if (!expires) {
		expires = new Date();
	}
	document.cookie = name + "=" + escape(value) + "; expires=" + expires.toGMTString() +  "; path=/";
}

function get_cookie(name) {
	cookie_name = name + "=";
	cookie_length = document.cookie.length;
	cookie_begin = 0;
	
	while (cookie_begin < cookie_length) {
		value_begin = cookie_begin + cookie_name.length;
		if (document.cookie.substring(cookie_begin, value_begin) == cookie_name) {
			var value_end = document.cookie.indexOf (";", value_begin);
			if (value_end == -1) {
				value_end = cookie_length;
			}
			return unescape(document.cookie.substring(value_begin, value_end));
		}
		cookie_begin = document.cookie.indexOf(" ", cookie_begin) + 1;
		if (cookie_begin == 0) {
			break;
		}
	}
	return null;
}

function save_cookie(value) {
	var name = "tehenergo.ru_menu_hidden";
	var tmp = value;
	expires = new Date();
	expires.setTime(expires.getTime() + (1000 * 86400 * 365));
	set_cookie(name, tmp, expires);
}