if ($p_roz == ".gif" || $p_roz == ".GIF"){
                                
                                    @header("Content-type: image/jpeg");
                                    $image = @imagecreatefromgif($folder.$p_nazwa_zm);
                                
                                    @list($szerokosc, $wysokosc) = @getimagesize($folder.$p_nazwa_zm);
                                
                                    $nowa_szerokosc = 640;
                                
                                    $nowa_wysokosc = $wysokosc * $nowa_szerokosc / $szerokosc;
                                    $image_new = @imagecreatetruecolor($nowa_szerokosc, $nowa_wysokosc);
                                    @imagecopyresized($image_new, $image, 0, 0, 0, 0, $nowa_szerokosc, $nowa_wysokosc, $szerokosc, $wysokosc);
                                    @imagejpeg($image_new, $folder.$p_nazwa_zm);