Help - accidentally deleted tablespace file

I am running Oracle 8.0.5 on Solaris.
I have a database with a number of tablespaces. In one tablespace which has just two indexes in it, I dropped the indexes, forgot to drop the tablespace, then did a (Unix) rm to remove the
file that the tablespace was created with. Now, when I try to do a dbstart, I get errors ORA-01157: cannot identify data file 23 - data not found ORA-01110: data file 23: (path to the file I deleted)

and I cannot get into sqlplus -

ORA-01033: ORACLE intialization or shutdown in progress

I can't restore the file from backup because I just created the tablespace today, and the backup job runs tonight. How do I undo my mess?

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