Hi Tobi,
Yes it did work. After following your advise I could actually already detect the orientationchange in DW CS 5.5 by an alert statement and in "Live view" changing the orientation (under the design window).
Just mentioning that I amazed how DreamWeaver manages to display the fully functional JQM/Phone GAP application in "Live View". I had it for a few weeks but it was not until yesterday I grasped its wonders i.e. figured out that I had it fully working in the split "Live view". Now I don't have to separately emulate or debug javascript, most thing could be tested while designing.
and once again your quick answer made me leap forward,
Wonderful,
Thanks