I am using mechanize and logging into the facebook also save the cookiesand fetch the data from $page_url. but next time when I try to fetch $pageurl, it will not give me proper result and showed me as logged out.Please let me know how can I reuse the cookies file next time instead of logging in again and again

 use strict;
use warnings ;
use WWW::Mechanize;
use HTTP::Cookies;

my $url = "http://www.facebook.com";
my $username = 'XXXXXXXX' ;
my $password = 'XXXXXXXX' ;

my $mech_request;

my $data = login() ;

my $page_url = "http://www.facebook.com/profile.php?id=100001726191116
+" ;
my $author_data = fb_pages( $page_url ) ;


sub login{

my $fname      = "fbkCookies.dat" ;
$cookie_jar = HTTP::Cookies->new( file=>$fname, autosave=>1, ignore_di
+scard=>1 )    ;
cookie_jar->save( $fname );                                           
+        
$mech_request  = WWW::Mechanize->new( autocheck => 0 ) ;
$mech_request->cookie_jar( $cookie_jar ) ;                            
+      
my $res      = $mech_request->get( $url   ) ;
$mech_request->get( $url                  ) ;
$mech_request->form_name( 'menubar_login' ) ;
$mech_request->field( email => $username  ) ;
$mech_request->field( pass => $password   ) ;
$mech_request->click()                      ;

my $contents = $mech_request->content()     ;
return $contents ;
}

sub fb_pages
{
    my $url = shift ;

    my $res  = $mech_request->get( $url ) ;
    $mech_request->get( $url )            ;
    my $data = $mech_request->content()   ;

    return $data;
}
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