What do you mean by this:
all backup jobs have been accidentaly deleted
Do you mean the scheduled jobs (under tab Job Definitions) have been deleted?
Or do you mean the list of backups on the Restore tab are deleted?
If it's the scheduled jobs, you are just going to have to recreate them. If it's the backups on the Restore tab, just run a CATALOG job on the tapes.
-SQLBill
Posting advice: FAQ481-4875