Perl - Passing cookies received with CGI::Cookie through to and from LWP::UserAgent->Post

I'm running Perl CGI in an Apache environment.

My Perl script calls another page on my domain using LWP::UserAgent->Post. It takes the html that is returned and passes it back (prints it) to my user.

I would like to pass all of the cookies sent to my script on to the page I'm posting to. I'd also like to send back any cookies returned from the page I posted to, back to my user.

The purpose of my script is to add some credentials to the http post data so we can avoid storing them as hidden fields on our web pages.

#!/usr/bin/perl
use CGI;
$q = CGI->new;

use LWP::UserAgent;
$ua = LWP::UserAgent->new;

# how do I copy the cookies passed to this script to the UserAgent so I can pass them to $url?
my $result = $ua->post($url, \%PostData ); 

if ($result->is_success) {
	# how do I copy the cookies returned from $url back to my user?
	print "Content-Type: text/html\n\n";
	print $result->decoded_content;
}