function CallBackProc(H, HMainForm: hwnd): Boolean; stdcall;
var
  hChild : hwnd;
begin
  Result := True;
  if GetParent(H) = HMainForm then begin //可以在這里進一步判斷類名，以免關(guān)掉其他彈出窗口
    hChild := FindWindowEx(H, 0, PChar('Button'), PChar('確定'));
    if hChild > 0 then SendMessage(hChild, BM_Click, 0, 0);
  end;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  EnumWindows(@CallBackProc, Self.Handle);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Self.WebBrowser1.Navigate('C:\Documents and Settings\jiaotongju\桌面\test2\test.htm');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Self.Timer1.Enabled := True;//Web頁面裝載完畢后開啟Timer
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Self.Timer1.Enabled := False;
  Self.Timer1.Interval:= 100;
end;