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;