alarm/central locking on vauxhall vectra 2.0 diesel 1999?

the remote key fob wasnt working so i opened the drivers door with the key and the alarm went of so i pressed the button on the dash this stopped it going off. since then only the drivers door will open, the cental locking doesnt work and the light above the alarm button on the dash flashes.
i replaced the battery in the key fob and tried syncronising it as requested in the manual but it still doesnt work and i cant open any other doors except the drivers
Thanks Antony

antony goodall
October 2006