+sub use_stylesheet {
+ my $self = shift;
+
+ $self->{stylesheet} = [ $self->{stylesheet} ] unless ref $self->{stylesheet} eq 'ARRAY';
+ $self->{stylesheet} = [ grep { -f }
+ map { m:^css/: ? $_ : "css/$_" }
+ grep { $_ }
+ (@{ $self->{stylesheet} }, @_)
+ ];
+
+ return @{ $self->{stylesheet} };
+}