A319 EXPERIENCES LOUD POP ACCOMPANIED WITH WINDSCREEN BREAKING. DIVERT TO JAX AFTER DECLARING EMER.

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I WAS THE FO AND PF. IN CRUISE FLT AT FL370; THERE WAS A LOUD 'POP' AND I LOOKED UP TO FIND MY FORWARD WINDSHIELD SHATTERED. I PUT ON MY OXYGEN MASK/GOGGLES; AND THE CAPT DID THE SAME. HE REQUESTED LOWER; AND ATC CLRED US TO FL330. I RECOMMENDED WE DECLARE AN EMER AND LAND ASAP; AND THE CAPT THEN DID DECLARE AN EMER AND STATED OUR INTENTION TO LAND IN JAX. I RAN THE CHKLIST FOR CRACKED WINDSHIELD WHILE THE CAPT FLEW THE ACFT. I HAD XFERRED CTL TO HIM; SINCE I COULD NOT SEE OUT THE WINDSHIELD. AS WE DSNDED AND THE DIFFERENTIAL PSI BECAME LESS; GLASS FRAGMENTS BEGAN FALLING IN FROM THE WINDSHIELD. I SUGGESTED KEEPING A 1 PSI PRESSURE TO KEEP AN OUTWARD FORCE ON THE WINDSHIELD; WHICH WE THEN DID BY GOING TO MANUAL PRESSURE CTL. ARRIVING FOR A VISUAL ON RWY 7 AT JAX; WE WERE HIGH AND FAST; SO THE CAPT ELECTED TO GO AROUND. WE DID A VISUAL PATTERN AND LANDED WITHOUT INCIDENT. AT THE GATE; CLOSER INSPECTION BY MAINT REVEALED THAT IT WAS ONLY THE INNER LAYER OF THE WINDSHIELD THAT HAD FAILED.