Removing Quotes from TQuery parameters

I want to use the 'in' clause in a Tquery and pass the list of items in as a
parameter. i.e..

select *
from sometable
where keyfield in (parameter_list_goes_here)

I want to be able to set the parameter as
 "key1", "key2", "key3" etc.

has anyone tried this? Is it even possible?

Any help appreciated.

Wayne