Thanks, I tried that, but it didn't work. Thanks for pointing out the tool though, I had been searching for quite some time for that.
The problem is the current "owner" doesn't exist. When I choose the site from the list it sais that the site belongs to a client that doesn't exist. It's a person I simply created for testing at the beginning and then deleted. So now the change doesn't "stick". It sais "The site has been moved", but when I open the tool again it still sais the same owner. I tried by creating a new customer dependent site and then changing the owner, and that works fine, but if I create a site customer independent, I can't move it afterwards.
Any ideas? Does anyone know witch field in the db corresponds to the client who owns a website? It should only be a number in the website table that represents the client unique id, but it doesn't seem that simple.