If you didn't have your "domain" file (username/library/iweb/domain), you have a problem.
If you're using time machine you can retrieve the file from an earlier date.
Regardless it's always a good idea to back it up. There is no was to "import" the site back from the published state. Only option would be copying graphic, text, etc. from the published site and creating a new site from scratch.
Good luck.
where do I find username/library/iweb/domain in time capsule, I did back up all before I installed new operating system, I did a migration assistant upload of all files, but iWeb still comes up empty.
ANy help would be appreciated