Are you doing:

  print $query->header;
[download]

or

  print header;
[download]

If the latter, you will need to change your use CGI into:

  use CGI qw(:standard);
[download]

Or something of that sort, as CGI is not exporting any functions by default.

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print