Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   UrlMon;

 function DownloadFile(SourceFile, DestFile: string): Boolean;
 begin
   try
     Result := UrlDownloadToFile(nil, PChar(SourceFile), PChar(DestFile), 0,
       nil) = 0;
   except
     Result := False;
   end;
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 var
   k, p: Integer;
   Source, dest, ext: string;
 begin
   for k := 0 to WebBrowser1.OleObject.Document.Images.Length - 1 do
   begin
     Source := WebBrowser1.OleObject.Document.Images.Item(k).Src;
     p := LastDelimiter('.', Source);
     ext := UpperCase(Copy(Source, p + 1, Length(Source)));
     if (ext = 'GIF') or (ext = 'JPG') then
     begin
       p  := LastDelimiter('/', Source);
       dest := ExtractFilePath(ParamStr(0)) + Copy(Source, p + 1,
         Length(Source));
       DownloadFile(Source, dest);
     end;
   end;
 end;