onpload errors

We're trying to fire 10 onpload jobs at a time from a script. For some reason, the first one fails but all the others succeed (with a different SHM key!). Has anyone else seen this behaviour? 23:30:19 shmget: [EEXIST][17]: key 49070000: shared memory already exists 23:30:19 mt_shm_init: can't create resident segment onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 onpload : attached successfuly using key 49080000 TIA Bob Roussey