Php converting jpegs to pjpegs: Help

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 Can someone tell me why, or better yet how I can make sure that PHP doesn't
turn my non-progressive jpegs to pjepgs on upload?  Using the code below, if
I upload a non-progressive jpeg, PHP tells me that the file uploaded
successfully, and the file is of type pjpeg. How can I avoid this problem?

************************MY CODE***************************************

<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<?php
// specify the file to write to
$filename = 'portfolio.xml';

//specify the content to write
$somecontent =
"\r\n<portfolioItem><image>".$HTTP_POST_FILES['userfile']['name']."</image><
/portfolioItem>";

//<portfolioItem><image>images/bride10.jpg</image></portfolioItem>


// specify the directory where the uploaded file should end up //$path =
'images/' ; $path = 'PHP_Library/'; 

// specify the filetypes allowed
$allowed = array('image/gif','image/pjpeg','image/jpeg','image/png'); 

// specify the max filesize in bytes
$max_size = 200000; 
   
///checks to see if file field is not null
if(isset($HTTP_POST_FILES['userfile']))
{
  if(is_uploaded_file($HTTP_POST_FILES['userfile']['tmp_name']))
  { 
   if($HTTP_POST_FILES['userfile']['size'] < $max_size) 
   { 
    if(in_array($HTTP_POST_FILES['userfile']['type'],$allowed)) 
    { 
     if(!file_exists($path . $HTTP_POST_FILES['userfile']['name'])) 
     { 
 
if(@rename($HTTP_POST_FILES['userfile']['tmp_name'],$path.$HTTP_POST_FILES['
userfile']['name'])) 
      { 
	  if (is_writable($filename)) {
	     if (!$handle = fopen($filename, 'a')) {
         echo "Cannot open file ($filename)";
         exit;
   		} if (fwrite($handle, $somecontent) === FALSE) {
       echo "Cannot write to file ($filename)";
       exit;
   }
   
   echo "The file '".$HTTP_POST_FILES['userfile']['name']."' was uploaded
successfully";
   
   fclose($handle);

}
	   //fopen($filename, 'a');
	   //fwrite ($filename, $somecontent);
	   //fclose($handle);
       $html_output = '<br>'; 
       $html_output .= 'File Name:
'.$HTTP_POST_FILES['userfile']['name'].'<br>'; 
       $html_output .= 'File Size: '.$HTTP_POST_FILES['userfile']['size'].'
bytes<br>'; 
       $html_output .= 'File Type:
'.$HTTP_POST_FILES['userfile']['type'].'<br>'; 
	   //echo "this is the name".['name'];
	  
       $image = $HTTP_POST_FILES['userfile']['name'] ; 
      }else{ 
       $html_output = 'Upload failed!<br>'; 
       if(!is_writeable($path)) 
       { 
        $html_output = 'The Directory "'.$path.'" must be writeable!<br>'; 
       }else{ 
        $html_output = 'an unknown error ocurred.<br>';       
       } 
      } 
     }else{ 
      $html_output = 'The file already exists<br>'; 
     } 
    }else{ 
     $html_output = 'Wrong file type<br>'; 
    } 
   }else{ 
    $html_output = 'The file is too big<br>'; 
   }
  }
}else{
  $html_output = '<form method="post" enctype="multipart/form-data"
action="'.$_SERVER['PHP_SELF'].'">';
  $html_output .= '<input type="file" name="userfile">';
  $html_output .= '<input type="submit" value="upload">';
  $html_output .= '</form>';
} 

echo '<html><head><title>Uploader</title></head><body>';
echo $html_output;
echo '</body></html>'; 

?> 

</body>
</html>

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