Its work, Thanks Paul.

But one thing happen, any of ' " ' and ' & ' now change to &Quot; and &Amp;, is it effect from tag below ?

Please help.

sub {
my $tags = shift;
my $description = $tags->{Description};
$description = GT::CGI::html_escape($description);
$description = lc($description);
$description =~ s/\b(\w)/\U$1/g;
$description =~ s/\bOf\b/of/g;
return $description;
}