window.IndexedDB = {
 indexedDB : window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB,

 storeParams: {keyPath:'key', autoIncrement:false},

open : function(cbk, mod) {
   var orq = this.indexedDB.open('geos');
   orq.onsuccess = function(e) {
    if (window.mozIndexedDB) {
     try {
      cbk(e.target.result.transaction(['pos'], mod).objectStore('pos'));
     } catch(l) {
      cbk(e.target.result.transaction(['pos'], ((mode === 0)?'readonly':'readwrite')).objectStore('pos'));
     }
    } else {
     cbk(e.target.result.transaction(['pos'], mod).objectStore('pos'));
    }
}},

 reinstall : function() {
  this.indexedDB.deleteDatabase('geos');
  var orq = this.indexedDB.open('geos');
  orq.onupgradeneeded = function(e) {
   e.target.result.createObjectStore('pos', IndexedDB.storeParams);
  };
  orq.onsuccess = function(e) {
   if (e.target.result.setVersion) { //chromium
    var crq = e.target.result.setVersion(2);
    crq.onsuccess = function(e) {
     e.target.source.createObjectStore('pos', IndexedDB.storeParams);
  }}};
 },

 read : function(key, cbk) {
  this.open(function(obst) {
   obst.get(key).onsuccess = function(e) {cbk(e.target.result);}
 }, 0);
},

 save : function(obj) {
  this.open(function(obst) {obst.put(obj);}, 1);
 }
};