Start rebuilding with last month's (50 cent) DVD copy.
You SURELY kept a BACKUP at least monthly, if not weekly?
Don't you have a copy on your HD? Check from you last update. Search by date and time.
ASK for HELP - on your opening URL page for folks to send you their computer's memory cache. Review your logs, determine your last 500 visitors and ask them - also post the URL in your favorite newsgroups, or links connections, someone may still have it in their cache.
If all is lost, you can find a structure of sorts in Library of Congress "WayBackMachine."
Good luck.
Sincerely,
Gargoyle