root@wor [/home/site82/public_html/cgi-bin]# perl stats.cgi
Prototype mismatch: sub main::head: none vs ($) at stats.cgi line 19
today: 0 (from )
last: 0 (from )
this: 0 (from )
yesterday: 0 (from )
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if (length ($ENV{'QUERY_STRING'}) > 0){
      $buffer = $ENV{'QUERY_STRING'};
      @pairs = split(/&/, $buffer);
      foreach $pair (@pairs){
           ($name, $value) = split(/=/, $pair);
           $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg
+;
           $in{$name} = $value; 
      }
 }

my $id = param('id');

use LWP::Simple;
$id2 = get ("http://www.domain.com/stats.php?id=$id");
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Prototype mismatch: sub main::head: none vs ($) at stats.cgi line 19

See CAVEAT in the LWP::Simple docs:

Note that if you are using both LWP::Simple and the very popular CGI.pm module, you may be importing a head function from each module, producing a warning like "Prototype mismatch: sub main::head ($) vs none". Get around this problem by just not importing LWP::Simple's head function, like so:

use LWP::Simple qw(!head);
use CGI qw(:standard);  # then only CGI.pm defines a head()
[download]

As for "The first part of the script is" part:  why are you parsing the QUERY_STRING yourself, when you're using CGI.pm anyway — as the warning and your line my $id = param('id') indicates?  CGI.pm does the parsing already, so you can just drop that code...