But that way you lose the old value. I'm not sure that that's really what you want:

Of course it isn't. :-) I thought I would be actually using code like in my example and therefore I thought it would be working, but this doesn't seem to be the case. I can't find it anymore, seems I've rewritten it before running into the problem shown and couldnt' remeber anymore. Seems I now have to reasons for don't using things like that, thanks. :-)