// Use this function to retrieve a cookie.
function getCookie(name){
	var cname = name + "=";
	var dc = document.cookie;
	if (dc.length > 0) {
		begin = dc.indexOf(cname);
		if (begin != -1) {
			begin += cname.length;
			end = dc.indexOf(";", begin);
			if (end == -1) {
				end = dc.length;
			}
			return unescape(dc.substring(begin, end));
		}
	}
	return null;
}

// Use this function to save a cookie.
function setCookie(name, value, expires) {
	document.cookie = name + "=" + escape(value) + "; path=/" +
		((expires == null) ? "" : "; expires=" + expires.toGMTString());
}

// Use this function to delete a cookie.
function delCookie(name) {
	document.cookie = name + "=; expires=Thu, 01-Jan-70 00:00:01 GMT" +  "; path=/";
}