Focus to last window problem

[Alan]

Hello,

I've just switched from fvwm to openbox (version 3.4.5 from debian 
testing) and configured it to my taste.
Almost everything is great, except the focus behaviour.

I'm using the following parameters as I want a follow mouse policy.
    <focusNew>no</focusNew>
    <followMouse>yes</followMouse>
    <focusLast>no</focusLast>
    <underMouse>yes</underMouse>
    <focusDelay>0</focusDelay>
    <raiseOnFocus>no</raiseOnFocus>

The problem I have is that when I move the pointer outside a window, it 
keeps the focus until I enter a new window. What I'd like would be to 
have no more focus when I leave a window until I enter a new one.

Is there any solution ?

Thanks in advance.