window.LocalStorage = {
 storage: window.localStorage,

 save : function(obj) {
  var pos = this._unpack('pos');
  pos[obj.key] = obj;
  this.storage.setItem('pos', JSON.stringify(pos));
 },

 read : function(key, cbk) {
  cbk(this._unpack('pos')[key]);
 },

 _unpack : function(key) {
  var data = this.storage.getItem(key)
  return (data)?jQuery.parseJSON(data):{};
 }
};