text: define(["image"], function(Image) {
      function MobileFileSystem() {
      }
      
      MobileFileSystem.isValid = function() {
          return false;
      }
      
      MobileFileSystem.prototype.getDir = function() {
          return [];
      }
      
      /**
      * Returns an URI that an ImageElement can understand. Can be an URL or base64 encoded image data
      **/
      MobileFileSystem.prototype.getDataURI = function(url) {
          throw "Not Implemented Yet";
      };
      
      var instance;
      MobileFileSystem.getInstance = function() {
          if (!instance)
              instance = new MobileFileSystem();
          return instance;
      }
  
      return MobileFileSystem;
  });