function set_cookie (name, value, exp_y, exp_m, exp_d, path, domain, secure) {
	var cookie_string = name + "=" + escape(value);
	if (exp_y) {
		var expires = new Date(exp_y, exp_m, exp_d);
		cookie_string += "; expires=" + expires.toGMTString();
	}
	if (path)	cookie_string += "; path=" + escape(path);
	if (domain)	cookie_string += "; domain=" + escape(domain);
	if (secure)	cookie_string += "; secure";
	document.cookie = cookie_string;
}

function get_cookie (cookie_name) {
	var results = document.cookie.match (cookie_name + '=(.*?)(;|$)');
	return results ? unescape(results[1]) : null;
}

function delete_cookie (cookie_name) {
	var cookie_date = new Date ();  // current date & time
	cookie_date.setTime (cookie_date.getTime() - 1);
	document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function setSound(mode) {
	set_cookie('sound', mode);
}

function getSound() {
	return (get_cookie('sound') == 2) ? false : true;
}