PR_STATIC_CALLBACK(PLHashEntry*) pref_AllocEntry(void *pool, const void *key)
PR_STATIC_CALLBACK(PRIntn) pref_ClearUserPref(PLHashEntry *he, int i, void *arg)
PR_STATIC_CALLBACK(PLHashEntry*) pref_AllocEntry(void *pool, const void *key){    return malloc(sizeof(PLHashEntry));}