XP_BZERO(&message_data, sizeof(IL_MessageData));
nsCRT::zero(&message_data, sizeof(IL_MessageData));
il_transparent_notify(il_container *ic){    IL_MessageData message_data;    IL_ImageReq *image_req;        XP_BZERO(&message_data, sizeof(IL_MessageData));	PR_ASSERT(ic->clients);    for (image_req = ic->clients; image_req; image_req = image_req->next) {        message_data.image_instance = image_req;        XP_NotifyObservers(image_req->obs_list, IL_IS_TRANSPARENT,                           &message_data);    }}