$.store is a simple, yet easily extensible, plugin to persistently store data on the client side of things. It uses window.localStore where available. Older Internet Explorers will use userData. If all fails $.store will save your data to window.name.
Note: The windowName will only do JSON serialization. windowName is not persistent in the sense of making it accross a closed browser window. If you need that ability you should check $.storage.driver.scope == "browser".
//initialize
$.storage = new $.store();
// save a value
$.storage.set( key, value );
// read a value
$.storage.get( key );
// deletes a value
$.storage.del( key );
// delete all values
$.storage.flush();
$.store is published under the MIT license and GPL v3.