[openbox] How to exec-or-jumpto in openbox?

[Mogei Wang]

Hi,

For example, the following keybinding in fluxbox, i.e.,
```
    Mod4 e :If {Some Matches (emacs)} {NextWindow (emacs)} {Exec emacs}
```
will cycle through Emacs windows, if they are open; and will open one, if
none is open.

How to do this in openbox?
I have noticed the action of "if" in [1], but cannot manage to get it works.

Best,
M.W.

[1] http://openbox.org/wiki/Help:Actions#If
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