// adapted from http://www.quirksmode.org/js/cookies.html

function cookieSet(name, value, days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime() + days * 86400000);
		var expires = '; expires=' + date.toGMTString();
	}
	else { var expires = ''; }
	document.cookie = name + '=' + value + expires + '; path=/';
}

function cookieRead(name) {
	var nameEQ = name + '=';
	var ca = document.cookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i];
		while (c.charAt(0) === ' ') c = c.substring(1, c.length);
		if (c.indexOf(nameEQ) === 0) { return c.substring(nameEQ.length, c.length); }
	}
	return null;
}

function cookieDelete(name) {
	createCookie(name, '', -1);
}