Thanks but like I said I just need the DHTML Popup/Layer part.
The survey wount run in the layer.
It just shows the link to the survey.
After I thought about it, the popup should work like this:
Every user sees it (X to close it).
After a user saw it he gets a cookie that times out in 2 days.
Each user with a cookie does not get the popup again.
It's just a notifier