mCurSideOfContent = 1; FillGenIter(mCurSideOfContent); if (!mGenIter) mCurSideOfContent = 0;
nsresult nsContentIterator::Last(){  if (!mLast)     return NS_ERROR_FAILURE;  mIsDone = PR_FALSE;  if (mLast == mCurNode)     return NS_OK;  mCurNode = mLast;  return NS_OK;}