8 byte wide integer - how?

I'd like to know how could I use 8 byte wide integers in PostgreSQL
tables. I recently upgraded to PostgreSQL 6.4.2 and am able to create
tables with int8 attributes, but can't load 8byte wide values in them.

            Thanks in advance

--------------------------------------------------------------------------------
Sebestyén Zoltán <szoli@netvisor.hu>    I'm believing that the Holy Spirit is
                    gonna allow the hand, and the foot, and
MAKE INSTALL NOT WAR            the mouth, just to begin to speak, and
                                        to minister, and to heal coordinated by
                    the head.

I use UNIX because reboots are for hardware upgrades.

            -- Eagerly waiting for FreeBSD 2.2.8 --