code: function() {
  			var _this = this;
  			if (_this._engine.clear) {
  				_this._engine.clear();
  			}
  			// for FF 3, fixed in FF 3.5
  			else {
  				for (var i = _this.length, key; 0 <= i; i -= 1) {
  					key = _this._key(i);
  					_this._removeItem(key);
  				}
  			}
  		}
docs: /*
  Implementation to clear the values from the storage engine.
  @see YAHOO.util.Storage._clear