function setCookie(key, value) {
	document.cookie = key + "=" + escape(value);
}

function getCookie(key) {
	if (document.cookie.length) {
		var cookies = ' ' + document.cookie;
		var start = cookies.indexOf(' ' + key + '=');
		if (start == -1) { return null; }
		var end = cookies.indexOf(";", start);
		if (end == -1) { end = cookies.length; }
		end -= start;
		var cookie = cookies.substr(start,end);
		return unescape(cookie.substr(cookie.indexOf('=') + 1, cookie.length - cookie.indexOf('=') + 1));
	}
	else { return null; }
}

function clearCookie(key) {
	document.cookie = key + "=; expires=" + (new Date()).toGMTString();
}