Automaticly delete related data

Hi!

I'm developing a publishing system and are trying to create
functions/triggers that automaticly wipes out related data to the data
currently beeing deleted...

For example, I have a table containing site objects (an article or
whatever) where I have the following fields;

int_objectid SERIAL NOT NULL,
str_objecttitle VARCHAR(255) NOT NULL,
...
...

Then, I have a table defining the content of that data;
int_objectid INT(11) NOT NULL
str_data TEXT NOT NULL,
...
...

What I want to do is;
When I delete a row from the first table, I want all rows with mathing
int_objectid values in the second table to be deleted.

I've been reading in a couple of online books and the PostgreSQL
documentation all day without beeing able to make something of this...

Can anyone give me a hint, or point me in the direction of some
documentation that can help me out?

Sincerly,
Trond Arve Nordheim