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А вот код файла image.php

$infile = '../gallery/foto/' . $_GET['file'];
  $sizs = GetImageSize($infile);
  $width = $sizs[0];
  $height = $sizs[1];
  $razm_x = 70;
  $razm_y = 100;
if ($width <= $razm_x && $height <= $razm_y) { 
  $tn_width = $width;
  $tn_height = $height;
} else {
  $tn_width = $width > $razm_x ? $razm_x : $width;
  $tn_height = $height > $razm_y ? $razm_y : $height;
}
  $format = format($infile);
    switch ($format) {
    case 'gif':
  $im = ImageCreateFromGIF($infile);
    break;
    case 'jpg':
   $im = ImageCreateFromJPEG($infile);
     break;
     case 'jpeg':
    $im = ImageCreateFromJPEG($infile);
      break;
      case 'png':
     $im = ImageCreateFromPNG($infile);
      break;
}

  $im1 = imagecreatetruecolor($tn_width, $tn_height);
  imagecopyresized($im1, $im, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
   switch ($format) {
   case 'gif':
  header("Content-type: image/gif");
  ImageGif($im1);
   break;
   case 'jpg':
  header("Content-type: image/jpeg");
  imageJpeg($im1);
    break;
    case 'jpeg':
  header("Content-type: image/jpeg");
  imageJpeg($im1);
    break;
    case 'png':
  header("Content-type: image/png");
  imagePng($im1);
    break;
}
  imagedestroy($im);
  imagedestroy($im1);