To do this follow the steps here and make sure to remove the extensions and install them again afterwards:
showpost.php?p=12293&postcount=2
I tried all that (above) to no avail, (running as a user account under OSX 10.6.7, CS3, CSSMenuWriter205) so I experimented by logging in as Admin and creating a fresh Dreamweaver web site and installing the MenuWriter extension I then got what was expected - namely in the 'Preview' window I could see a representation of the menu. So, thinking I had solved the problem went back to my user account, but I still get the dreaded "click here to preview in a browser" message in the center of the 'Preview' field, and nothing else.
Does Dreamweaver need to be run as Admin for the Preview to work correctly?
Thanks,
John :-#)#