window.WebSQL = {
 _open : function() {
  return window.openDatabase('geos', '', 'myDB', 50000000);
 },

 reinstall : function(vers) {
  var db = this._open();
  db.changeVersion(db.version, vers, function(t) {
    t.executeSql('CREATE TABLE pos (id, lat float, lon float)');
  });
 },

 read : function (key, cbk) {
   this._open().readTransaction(function(t) {
    t.executeSql('SELECT * FROM pos WHERE id = ?', [key],
      function(t, d) {d.rows.length?cbk(d.rows.item(0)):''},
      function(t, e) {console.log(e.message)});
   });
 },

 save : function(obj) {
  this._open().transaction(function(t,r) {
   t.executeSql('INSERT INTO pos (id, lon, lat) VALUES (?, ?, ?)',
    [obj.key, obj.lon, obj.lat])
  });
 }
};