commit inside plpgsql function

Hi,

I am converting oracle stored procedures to plpgsql. There are several 
of the oracle procedures where a parameter vCommit is passed into the 
procedure and:

if vCommit = 1   then       commit;       do_something_commit(vdate);   else       do_something(vdate);   end if;

does this make sense in plpgsql? Does it make sense to do a commit in 
plpgsql?

Thanks,

Dennis