procedure TForm1.FormCreate(Sender: TObject);
begin
panel2.Top:=panel1.Top+panel1.Height;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
panel1.Top:=panel1.Top-2;
panel2.Top:=panel2.Top-2;
if (panel1.Top+panel1.Height)<0 then
panel1.Top:=panel2.Top+panel2.Height;
if (panel2.Top+panel2.Height)<0 then
panel2.Top:=panel1.Top+panel1.Height;
end;