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Image1.Picture.LoadFromFile('C:\Grafik.bmp');					

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uses
 ... JPEG,...					

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unit Unit1;

interface

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

type
  TMyImg = class(TImage)
  private
    procedure CMMouseEnter(var Msg: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Msg: TMessage); message CM_MOUSELEAVE;
  end;

  TForm1 = class(TForm)
    Button1: TButton;
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private-Deklarationen }
    MyImg: TMyImg;
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}            

procedure TMyImg.CMMouseEnter(var Msg: TMessage);
begin
  inherited;
  Picture.LoadFromFile(ExtractFilePath(ParamStr(0)) + 'BMP1.bmp');
end;

procedure TMyImg.CMMouseLeave(var Msg: TMessage);
begin
  inherited;
  Picture.LoadFromFile( ExtractFilePath(ParamStr(0)) + 'BMP2.bmp');
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  MyImg := TMyImg.Create(Self);
  MyImg.Parent := Self;
  MyImg.Left := 10;
  MyImg.Top := 10;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  MyImg.Free;
end;

end.					

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interface

type
  TmyImage = class(TImage)
  private
    FOnMouseLeave: TNotifyEvent;
    FOnMouseOver: TNotifyEvent;
    procedure CMMouseEnter (var Message : TMessage); message CM_MouseEnter;
    procedure CMMouseLeave (var Message : TMessage); message CM_MouseLeave;
  public
  published
    property OnMouseOver : TNotifyEvent read FOnMouseOver write FOnMouseOver;
    property OnMouseLeave : TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
  end;

implementation

procedure TmyImage.CMMouseEnter(var Message: TMessage);
begin
  inherited;
  if Assigned(FOnMouseOver) then FOnMouseOver(self);
end;

procedure TmyImage.CMMouseLeave(var Message: TMessage);
begin
  inherited;
  if Assigned(FOnMouseLeave) then FOnMouseLeave(self);
end;