LAN Web TCP Delphi

Title: get all Frame URLs in TWebbrowser?
procedure TForm1.Button2Click(Sender: TObject);
var
i: Integer;
begin
Listbox1.Clear;
//if frames available
if Webbrowser1.OleObject.Document.Frames.Length 0 then
begin
//walk through all frames and get the url
//to the Listbox
for i := 0 to Webbrowser1.OleObject.Document.Frames.Length - 1 do
begin
Listbox1.Items.Add(Webbrowser1.OleObject.Document.Frames.item(i).Document.URL);
end;
end;
end;