I'd like to be able to position portlets windows on the screen and to set their size. Is that possible ? Actually I'm only able to set the zone attribute either to left, or center. The center portlets take all the remaining screen, which is not what I want. I'd like to be able to position them in screen coordinates. Also, the zone="right" parameter doesn't seem to work, since once set, the associated portlet is not visible any more and in the admin portlet it apears as zone=unknown.