Dialog, negative offset not working

Dialog, negative offset not working

Hi guys,
I'm using jquery 1.4.2 and UI 1.8.1, since I have a no-refresh application and on the dialog boxes I have some flash stuff, I can't close/hide the dialogs because that will scramble the flash, so I used the position option to hide them like so:

$('#add_version_modal').dialog({
autoOpen: true,draggable: false,resizable: false,closeOnEscape: false,
Height: 550,width: 650, position:[-10000,-10000],zIndex:-1,
                  .........
hiding the dialog by placing them out of view
that worked with 1.7.2 but with 1.8.1 the top and left become 0...it transforms any negative position to 0

what can I do to make the dialog to accept negative offset

Thanks