objectStorage

var objectStorage = objectStorage || (function() {

var storages = {};
var objectStorage = {
    get : function(storageName) {
        if (storageName in storages) {
            return storages[storageName];
        } else {
            var localValueJson = localStorage.getItem(storageName);
            var sessionValueJson = sessionStorage.getItem(storageName);
            var storage = {
                local : localValueJson ? JSON.parse(localValueJson) : {},
                session : sessionValueJson ? JSON.parse(sessionValueJson) : {}
            };
            storages[storageName] = storage;
            return storage;
        }
    },
    duration : 5000
};

var save = function() {
    for (var storageName in storages) {
        var storage = storages[storageName];

        localStorage.setItem(storageName, JSON.stringify(storage.local));
        sessionStorage.setItem(storageName, JSON.stringify(storage.session));
    }
};

setTimeout(function() {
    save();
    setTimeout(arguments.callee, objectStorage.duration);
}, objectStorage.duration);

return objectStorage;

})();