A300-600 DIVERTS TO A NEARBY ARPT WHEN PRESSURIZATION CONTROL IS LOST.

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IN CRUISE AT FL350 NOTICED ECAM WITH ALT ALERT WITH NO CHIME. INFO CAPT AND PULLED OUT THE QRH TO LOOK UP PROC. NO OTHER ASSOCIATED LIGHTS SO STARTED TO CLR ECAM WHILE READING QRH. THIS TIME GOT AN ALERT AND NOTICED THE CABIN WOULD NOT COME DOWN. THE MAX PSI OBSERVED WAS ABOUT 9780. TRIED BOTH REGULATORS AND SWITCHED TO MANUAL CTL WITH NO EFFECT UNABLE TO CTL THE CABIN PRESSURE. DECLARED AN EMER AND STARTED EMER DSND AND TURNED TO PROCEED TO ARPT ABOUT 100 NM AWAY. EXECUTED PROCS AND FLEW THE ACFT DOWN TO WITH OXYGEN MASK 14000 FT. ONCE UNDER APCH CTL CLRED TO 10000 FT REMOVED MASK FOR A VISUAL APCH TO RWY 14. UNEVENTFUL LNDG AND CANCELED ALL EMER ASSISTANCE ON THE GND. THE CAPT WENT IN TO TALK WITH DISPATCH UNDER US CUSTOM ESCORT TO FILE DIVERT PAPERWORK. I PROCEEDED TO CLEAN UP THE COCKPIT AND PERFORMED A POSTFLT WALKAROUND WITH US CUSTOM ESCORT AS ALL THE PAX REMAINED ON BOARD. NOTICED THE GND AIR HOOK UP WAS SHOWING VAPOR COMING FROM THE DOOR WITH IT CLOSED. REMEMBERED TALKING WITH A CAPT FROM ANOTHER FLT WHICH HAD THIS PROB. CALLED TO BASE WITH INFO DISCOVERED. ACFT WAS REPAIRED BY SECURING THE GND AIR DOOR PROPERLY AND THE FLT CONTINUED ON.