I find a solution with a little help of Ton Frederiks (you know him?).
I copied the embedded url into Dreamweaver.
Saved the file as a HTML-file.
And this file I selected in the Overlay Creator.
I used to copy and paste the url in the OC.
But select a file in the OC, seems to work better.
Tnx again Bob!!!!!!
And have a nice new year's eve!