immediate "NextWindow" without dialog?

[Chengqi(Lars) Song]

hi,

I want to switch to next/previous window in an immediate way. The default bind 'A-Tab' and 'A-S-Tab' can switch but the default configuration always show a dialog up:

        <keybind key="A-Tab">
            <action name="NextWindow"/>
        </keybind>
        <keybind key="A-S-Tab">
            <action name="PreviousWindow"/>
        </keybind>

I defined W-Down to this:

        <keybind key="W-Down">
            <action name="Lower"/>
            <action name="FocusToBottom"/>
            <action name="Unfocus"/>
        </keybind>

But can not switch to previous window, and it skips the iconified windows.

Is there any way in openbox to achieve immediate-double-directional-window-switching? Thanks.

best
lars