Java, Mac et parfois plus …

/**
 * Cookies management Javascript tool library.
 * FileName: cookiemanager.js
 * Date:     15/11/2006
 * Author:   Gabriel DROMARD
 */

/**
 * Retreive a cookie.
 * @param name The cookie name.
 */
var getCookie = function(name) {
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg) {
			var endstr = document.cookie.indexOf (";", j);
			if (endstr == -1) endstr = document.cookie.length;
			return unescape(document.cookie.substring(j, endstr));
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	}
	return null;
};

/**
 * Store a cookie.
 * @param name    Cookie name
 * @param value   Cookie value
 * @param expires (optional) the date on which the cookie will expire (default is current date + 300 days)
 * @param path    (optional) the cookie path
 * @param domain  (optional) the cookie domain
 * @param secure  (optional) Is the cookie secure ? (default value: false)
 */
var setCookie = function(name, value) {
	//alert('setCookie('+name+' = '+value+')');
	var expDays = 300;
	var exp = new Date();
	exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
	var argv = setCookie.arguments;
	var argc = setCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : exp;
	var path    = (argc > 3) ? argv[3] : null;
	var domain  = (argc > 4) ? argv[4] : null;
	var secure  = (argc > 5) ? argv[5] : false;
	document.cookie = name + "=" + escape (value) +
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
	((path == null) ? "" :    ("; path=" + path)) +
	((domain == null) ? "" :  ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "");
};

/**
 * Delete an existing cookie.
 * @param the cookie name.
 */
var deleteCookie = function (name) {
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = getCookie (name);
	if(cval != undefined) document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
};

JavaScript