Foreign Key

Hi,
I am using the triggers provided under contrib/spi/refint.* to implement
referential integrity in my database.
The check_primary_key function doesn't allow me to enter in a child
table if a corresponding primary key doesn't exists in the parent table
( implements 'dependency'). However I also want to 'automatically' add a
corresponding entry in the parent table in some of the relationships.
There is no option in the check_primary _key function for that.
Is there a newer version of the function available which will allow me
to specify what 'insert key rule' I want to implement?
If there is none then I may have to hack the code of check_primary_key
to do it. Is there someone who can help me do it faster?

Thanks,

Anand