define([
           'dojo/_base/declare',
           'JBrowse/Store/TiledImage/Fixed',
           'JBrowse/Util'
       ],
      function( declare, Fixed, Util ) {
return declare( Fixed,
/**
 * Subclass of TiledImageStore.Fixed to provide backward-compatibility
 * with image stores formatted with JBrowse 1.2.1.
 * @lends JBrowse.Store.TiledImage.Fixed_v0
 * @class
 * @extends JBrowse.Store.TiledImage.Fixed
 */
{
_imageSource: function( zoom, tileIndex ) {
    return Util.resolveUrl( this.url, '../../' + zoom.urlPrefix + tileIndex + ".png" );
}
});
});
