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        my $mech = WWW::Mechanize->new();
        print "Accessing $url\n";
...
        $mech->click_button (value => "TAB");
        $mech->save_content( $full_path );
        print "Done.\n";

Accessing http://spiedigitallibrary.org/ebooks/spies/kbart?isAuthorize
+d=no
Downloading the file...Can't call method "header" on an undefined valu
+e at /exlibris/sfx_ver/app/perl-5.10.1/lib/site_perl/5.10.1/WWW/Mecha
+nize.pm line 2381.