Don't forget the space after the colon on content-type. It's much simpler just to use all the shortcuts. Here's your whole program as shortcuts:

use CGI qw(:all);
print header, start_html("alphabetical sorter"), h1("alphabetical sort
+er");
if (param) {
  for my $key (sort param) {
    print strong($key), " = ", join(", ", param($key)), br;
  }
} else {
  print start_form;
  print textfield($_), br for 1..5;
  print submit, end_form;
}
print end_html;
[download]

Much, much cleaner.

-- Randal L. Schwartz, Perl hacker