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IF @source = @target 	RETURN ELSE BEGIN	IF @source < @target		SET              @step = 1 	ELSE		SET              @step = - 1		SELECT     @s_id = id                           FROM         howtos                           WHERE     pos = @source	WHILE @source <> @target  	BEGIN		SET	@t_pos = @source + @step 		SET	@s_pos = @source		SELECT     @t_id = id             		FROM         howtos             		WHERE     pos = @t_pos                                                                                  		UPDATE    howtos		SET              pos = @s_pos		WHERE     id = @t_id		UPDATE    howtos		SET              pos = @t_pos		WHERE     id = @s_id		SET @source = @t_pos	ENDEND