resize failed ??

hvorfor kommer den kun med på nogen af billederne selvom det skulle være fil format den skulle kunne tage ???

her er lidt af koden

//Funktioner som bruges:
function getExtension($filename){
    return strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) );
}

function resize( $filename, $newfilename, $maxw, $maxh, $quality=90 )
{
  $extension = getExtension($filename);
  switch($extension)
  {
    case 'jpeg':
    case 'jpe':
    case 'jpg':
      $srcim = imagecreatefromjpeg( $filename );
      break;
    case 'gif':
      $srcim = imagecreatefromgif( $filename );
      break;
    case 'png':
      $srcim = imagecreatefrompng( $filename );
      break;
    default:
      return false;
  }
(line 124) $ow = imagesx( $srcim );
  (line 125)$oh = imagesy( $srcim );
  (line 126)$wscale = $maxw / $ow;
  (line 127)$hscale = $maxh / $oh;
  $scale = min( $hscale, $wscale );
  $nw = round( $ow * $scale, 0 );
  $nh = round( $oh * $scale, 0 );
  (line 131)$dstim = imagecreatetruecolor( $nw, $nh );
  (line 132)imagecopyresampled( $dstim, $srcim, 0, 0, 0, 0, $nw, $nh, $ow, $oh );
  switch($extension)
  {
    case 'jpeg':
    case 'jpe':
    case 'jpg':
    (line 138) imagejpeg( $dstim, $newfilename, $quality );
      break;
    case 'gif':
      imagegif( $dstim, $newfilename );
      break;
    case 'png':
      $png_q = floor( abs( $quality / 10 - 9.9 ) );
      imagepng( $dstim, $newfilename, $png_q );
      break;
    default:
      return false;
  }
  (line 150)imagedestroy( $dstim );
  (line 151)imagedestroy( $srcim );
  return file_exists($newfilename);
}

//Er der trykket på Upload file knappen?
if(isset($_POST['myUpload']))
{
  //Har vi en fil?
  if(is_uploaded_file($_FILES['myFile']['tmp_name']))
  {
    //Filendelse
    $extension = getExtension($_FILES['myFile']['name']);
   
    //Er filen en af de filer vi gerne vil have?
    if(in_array($extension,$allowedFileTypes))
    {
      //Vi flytter filen fra tmp til vores UPLOADDIR
      if(move_uploaded_file($_FILES['myFile']['tmp_name'],$uploadDir . $tid . basename($_FILES['myFile']['name'])))
      {
          if(resize($uploadDir . basename($_FILES['myFile']['name']), $thumbDir . $tid . basename($_FILES['myFile']['name']), $thumbWidth, $thumbHeight, $thumbQuality)){
              echo '<h3 style="color:green;">File ('.basename($_FILES['myFile']['name']).') uploaded and resized succesfully</h3>';
          }else{
            echo '<h3 style="color:red;">File ('.basename($_FILES['myFile']['name']).') uploaded succesfully, but resize failed</h3>';
        }
      }
      else
      {
        echo '<h3 style="color:red;">Error - unable to upload file: '.basename($_FILES['myFile']['name']).'</h3>';
      }
    }
    else
    {
      echo '<h3 style="color:red;">Wrong filetype, allowed filetypes are: ('.implode(',',$allowedFileTypes).')</h3>';
    }
  }
  else
  {
    echo '<h3 style="color:red;">No file selected<h3>';
  }
}

og de her fejl kommer den med

Warning: imagecreatefromjpeg(../billeder/gorillabiffer.jpg) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory in /home/1/2/3/4/5/billeder.php on line 113

Warning: imagesx(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 124

Warning: imagesy(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 125

Warning: Division by zero in /home/1/2/3/4/5/billeder.php on line 126

Warning: Division by zero in /home/1/2/3/4/5/billeder.php on line 127

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /home/1/2/3/4/5/billeder.php on line 131

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 132

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 138

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 150

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/1/2/3/4/5/billeder.php on line 151