How did you "restore" it? Migration Assistant? If you restored your entire drive as imaged, you must not have backed up the iWeb site and it's pretty much gone forever.
Look in your ~/Library/Application Support/iWeb folder for a Domain file. Unless you excluded it from being backed up, it should have been preserved if your Documents and other stuff are intact. If you have more than one in there, double-click to open up the file in iWeb and see what you're dealing with. That file can also be copied to another computer with the same/newer version of iWeb and edited via another machine.