I'm ok with that - I was just hoping to get some hints on how.
Seems to be more involved that just enable/disable css. If I place the second dialog's div inside the blocked one, it kind of works. But it looks corny since the user cannot drag the second dialog outside the first dialog's borders.
jQuery UI is a bit on the heavy side and customizing the classes is cumbersome in my opinion. The looks feels a bit dated on jQuery UI, therefore I was looking at Block UI.
Thanks, hints appreciated.