Passing Multiple values into a simple SQL function?

[rotfil]

I have a function called dt_process_customer and I need to pass maybe 5 customer IDs into an SQL statement.. I think the statement should look something like the below bu ti am not sure.

select dt_process_customer in (233, 322) as one from dual

[wingnut]

Select dt_process_customer From tablename Where dt_process_customer in (233, 322)