that it's ok to pass in a null observer to LoadOverlay Make sure .Init() succeeds on our hashtables, otherwise return an out of memory error code. r/sr=bz a=asa git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_8_BRANCH@179421 18797224-902f-48f8-a5cc-f745e15eee43