use CGI qw/:standard *div/;
my $cgi = new CGI;
print $cgi->header(),
      $cgi->start_html(),
      $cgi->start_div({-id=>pagewrap}); # NOTICE ** START_DIV
if($index==0) { 
       print $cgi->p("Hello");
}

print $cgi->end_div(),
      $cgi->end_html();

##</code><code>##

use CGI ":standard";

my $cgi = new CGI;
print $cgi->header(),
  $cgi->start_html(),
  $cgi->div({-id=>pagewrap},
            $index==0 ?   $cgi->p("Hello") : ""
            ),
  $cgi->end_html();