Martin,

The nDirection cannot be both negative and positive at the same time. It's better to use DO CASE...ENDCASE for readability.

DO CASE
CASE nDirection<0
   * first action
   * move container top
CASE nDirection>0
   * second action
   * move container bottom
ENDCASE

>

>If nDirection<0
>   * first action
>   * move container top
>endif
>if nDirection>0
>   * second action
>   * move container bottom
>endif
>

>