I would like to suggest the following modifications:

   #!/usr/bin/perl -wT    #set warn and taint flags
   use strict;   #strict syntax checking
   use CGI qw/:standard :html3/;
   print "Content-type: text/html\n\n";
   etc.

You don't need the ":html3" for this little snippet, but you soon will if you start using the html shortcuts (recommended) and want to do anything more than simple pages. The standard feature set for CGI.pm (loaded by ":standard") only supports HTML 2.0 tags.

With "use strict;", you will need to declare $foo as "my $foo =..."

See the perl documentation for examples of the html shortcuts, which IMO make perl CGI progs which generate HTML far more readable, and also for more info on perl warnings, taint mode, and strict.