How do I send parameter to a stored procedure which expands to ['222','333']

create procedure getMyVal @cPara varchar(50)
as
select * from <ctable> where id in (@cPara)

calling

cPara= "'222','333'"
sqlexec(nHandle,"exec getMyVal ?cPara")

I am not able to send an InList equivalent string to SQLserver SP. I want the parameter to contain something like '222','333' so that IN Clause works on multiple values.
Can it work? Is there another way?