Cookies

var Cookies = function()
{
	//***** private properties and methods *****//
 
	//expires argument can be either a Date object or the number of seconds until it should expire
	// e.g.: 60: 1 minute from now
	//		 (false): end of session
	//		 -1: remove cookie
	function setCookie(name, value, expires, path, domain, secure)
	{
		if(!name || !name.toString()) return;
		value = value.toString() ? escape(value.toString()) : "";
 
		var expiration = "";
		if(expires)
		{
			//alert(typeof expires);
			if(expires.getTime) expiration = expires.toGMTString();	//expires on given Date
			else if(!isNaN(expires))	//expires in given number of seconds
			{
				var date = new Date();
				date.setTime(date.getTime()+(expires*1000));
				expiration = date.toGMTString();
			}
			//else expires at end of session
		}
		//else expires at end of session
 
		path = path || "/";
		domain = domain ? "; domain="+domain : "";
		secure = secure ? "; secure" : "";
		document.cookie = escape(name)+"="+value+"; expires="+expiration+"; path="+path+domain+secure;
	}
 
	//sets a cookie with an expiration date a number of years into the future
	function setPersistentCookie(name, value, years, path, domain, secure)
	{
		years = years || 50;
		setCookie(name, value, years*365*24*60*60, path, domain, secure);
	}
 
	function getCookie(name)
	{
		if(!name) return null;
		var nameEQ = escape(name) + "=";
		var ca = document.cookie.split(";");
		var c;
		for(var i=0; i<ca.length; i++)
		{
			c = ca[i];
			c = c.replace(/^\s*/, "");
			if(c.indexOf(nameEQ) == 0) return unescape(c.slice(nameEQ.length));
		}
		return null;
	}
 
	//Returns an array of cookie values; useful when there is more than one cookie with the same name.
	//Note that which cookies are returned and in what order depends on the browser, so it's impossible to determine which
	// instance of a name corresponds to which domain.
	//If a name is provided, it returns an array of values.
	//If a name isn't provided, it returns a 2D array of all name/value pairs.
	function getCookieArray(name)
	{
		name = name ? name.toString() : "";
		if(!name)
		{
			var ca = document.cookie.split(";");
			var r = [];
			for(var i=0; i<ca.length; i++)
			{
				ca[i] = ca[i].replace(/\s+/g,"");
				r[i] = [];
				r[i][0] = ca[i].replace(/^(.*?)=.*/i, "$1");
				r[i][1] = ca[i].replace(/^.*?=(.*)/i, "$1");
			}
			return r;
		}
		else
		{
			var nameEQ = escape(name) + "=";
			var ca = document.cookie.split(";");
			var c;
			for(var i=0; i<ca.length; i++)
			{
				ca[i] = ca[i].replace(/\s+/g,"");
				if(ca[i].indexOf(nameEQ) != 0) ca.splice(i--,1);
				else ca[i] = unescape(ca[i].slice(nameEQ.length))
			}
			return ca;
		}
	}
 
	function eraseCookie(name, path, domain)
	{
		setCookie(name, "", -1, path, domain);
	}
 
	function testSupport()
	{
		setCookie("test_cookie_support", "test");
		var check = getCookie("test_cookie_support");
		eraseCookie("test_cookie_support");
		return !!check;
	}
 
	//***** public properties and methods *****//
 
	return {
		set: setCookie,
		setPersistent: setPersistentCookie,
		get: getCookie,
		getArray: getCookieArray,
		erase: eraseCookie,
		supported: testSupport()
	};
}();	//initialize Cookies