my $filename = $cgi->param('uploaded_file');
     my $type = $cgi->uploadInfo($filename)->{'Content-Type'};

     #use the upload function
     if ($type eq 'image/jpeg') {
       open(IMAGE,">/image_dir/filename.jpg");
       my $fh = $cgi->upload('uploaded_file');
       binmode(IMAGE);
       while (<$fh>) {
           print IMAGE $_;
       }
       print '<img src="/image_dir/filename.jpg">';
     } else {
       print 'Not a JPEG<br>';
     }