my $request = POST 'http://wos4.isiknowledge.com/CIW.cgi', 
		    [Func => 'Search',
		     Form => 'HomePage',
		     SID => $sid,
		     topic => 'Enter a topic',
		     editions => [qw( D A H )],
		     Period => 'Year Range',
		     week_selection => 'LatestWeek',
		     years => 2004,
		     start_year => 1955,
		     end_year => 2004,
		     'General Search.x' => 2,
		     'General Search.y' => 2];

print $request->as_string();