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....
  doc := (ASender as TWebBrowser).Document as IHTMLDocument2;
  if not Assigned(doc) then Exit;
  for i := 0 to doc.frames.length - 1 do
  begin
    Fetched := nil;
    OleContainer := doc as IOleContainer;
    hres := OleContainer.EnumObjects(OLECONTF_EMBEDDINGS or OLECONTF_OTHERS,
      Enum);
    if hres <> S_OK then OleContainer._Release; else
    begin
      Enum.Skip(i);
      Enum.Next(1, Unk, Fetched);
      dframedoc := (Unk as IWebbrowser2).Document as IHTMLDocument2;
....