Restore yesterday’s backup to a new database name. Then run DTS (SQL 2000) or SSIS (SQL 2005) and port yesterday’s version of the table to your current database.
Then inspect the log. You may or may not be able to recover the data added since your last backup.
Then have your head examined. NO ONE (let me repeat) NO ONE should have direct access to tables but YOU. Everyone else should go through views or UDFs or sprocs. Nobody but YOU should have rights to delete a table!