The following has been working great for me to allow a logged-in user access to various pages.

use CGI;
my $q = new CGI;
my $sessid = $q->cookie('SESSID');

if (!$sessid)
{
    print $q->redirect("http://my.domain.com/loginpage/");
    exit;
}

my $cookie = $q->cookie(-name=>"SESSID", -value=> $sessid, -expires =>
+ "+1h");
print $q->header({-type=>"text/html", -charset=>"utf-8", -cookie=>$coo
+kie});
[download]

I'm modifying a new page, which has a series of links to reload the script with three variables, for year, month and day:

http://my.domain.com/cgi-bin/eventedit?year=2007&month=1&day=9
[download]

when i load the script using the link, the sessid ends up undefined, and the page redirects, even though i can see the sessid in the cookie!! does anyone know what's going on?

the thing i don't understand is that i've used this with a lot of other pages, and they work fine...