[m1sclick]

Код:

procedure TForm1.Button1Click(Sender: TObject);
begin
Timer1.Enabled:=true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
Timer1.Interval:=1000;
Button1.Caption:=inttostr(i);
dec(i);
if i < 0 then
begin
Timer1.Enabled:=false;
Button1.Caption:='Go!!';
end;
end;