/**
 * Implements JSON stringify and parse functions
 * v1.0
 *
 * By Craig Buckler, Optimalworks.net
 *
 * As featured on SitePoint.com
 * Please use as you wish at your own risk.
*
 * Usage:
 *
 * // serialize a JavaScript object to a JSON string
 * var str = Session_JSON.stringify(object);
 *
 * // de-serialize a JSON string to a JavaScript object
 * var obj = Session_JSON.parse(str);
 */

var Session_JSON = Session_JSON || {};

// implement JSON.stringify serialization
Session_JSON.stringify = Session_JSON.stringify || function (obj) {

	var t = typeof (obj);
	if (t != "object" || obj === null) {

		// simple data type
		if (t == "string") obj = '"'+obj+'"';
		return String(obj);

	}
	else {

		// recurse array or object
		var n, v, json = [], arr = (obj && obj.constructor == Array);

		for (n in obj) {
			v = obj[n]; t = typeof(v);

			if (t == "string") v = '"'+v+'"';
			else if (t == "object" && v !== null) v = Session_JSON.stringify(v);

			json.push((arr ? "" : '"' + n + '":') + String(v));
		}

		return (arr ? "[" : "{") + String(json) + (arr ? "]" : "}");
	}
};


// implement JSON.parse de-serialization
Session_JSON.parse = Session_JSON.parse || function (str) {
	if (str === "" || !str.isJSON() )
	{
		str = '{}';
	}
	eval("var p=" + str + ";");
	return p;
};



/**
 * Implements cookie-less JavaScript session variables
 * v1.0
 *
 * By Craig Buckler, Optimalworks.net
 *
 * As featured on SitePoint.com
 * Please use as you wish at your own risk.
*
 * Usage:
 *
 * // store a session value/object
 * Session.set(name, object);
 *
 * // retreive a session value/object
 * Session.get(name);
 *
 * // clear all session data
 * Session.clear();
 *
 * // dump session data
 * Session.dump();
 */

 if (Session_JSON && Session_JSON.stringify && Session_JSON.parse) var Session = Session || (function() {

	// window object
	var win = window.top || window;

	// session store
	var store = (win.name ? Session_JSON.parse(win.name) : {});

	// save store on page unload
	function Save() {
		win.name = Session_JSON.stringify(store);
	};

	// page unload event
	if (window.addEventListener) window.addEventListener("unload", Save, false);
	else if (window.attachEvent) window.attachEvent("onunload", Save);
	else window.onunload = Save;

	// public methods
	return {

		// set a session variable
		set: function(name, value) {
			store[name] = value;
		},

		// get a session value
		get: function(name) {
			return (store[name] ? store[name] : undefined);
		},

		// clear session
		clear: function() { store = {}; },

		// dump session data
		dump: function() { return Session_JSON.stringify(store); }

	};

 })();