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If you have a backup of the database when you were webmaster, you could look through it, in the table 'users', and find user id '1' which would have been you, and then just take the insert statement using phpmyadmin and execute the insert statement.
There could be other tables that you might need as well but that is a start.
If you don't have a backup let us know.
I am just guessing, but seems right to me.
Hope this helps,
John