Selecting From Different Tables

Using SQL2000. How do I format my select statement to choose one out
of 24 different tables? Each table is slightly different and I was
hoping I could use one select statement and format it on-the-fly
instead of using 24 different ones. I had in mind using a case
statement, something like this:

select * from
case when <input parameter> = 'something1' then tblSomething1
case when <input parameter> = 'something2' then tblSomething2
...and so on...

Thanks for any help.