[NumLock]

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Image2: TImage;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure WMTIMER(var Msg: TMessage); message WM_TIMER; 
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  Image2.Visible:=True;
  Image1.Visible:=False;
  Button1.Enabled:=False;
  SetTimer(Handle, 1, 1000, nil);
end;

procedure TForm1.WMTIMER(var Msg: TMessage);
begin
  KillTimer(Handle, 1);
  Close;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Image2.Visible:=False;
  Image1.Visible:=True;
end;

end.